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How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Replacing a worn out or damaged fuel primer bulb on a small engine is one of those repair jobs that sounds daunting but is actually quite straightforward with the right preparation and tools. For those not familiar, the primer bulb is a small rubber bulb that you pump to draw fuel from the gas tank into the carburetor prior to starting the engine. Over time, primer bulbs can crack, leak, or simply lose their flexibility, preventing them from effectively delivering fuel for cold starts.

In this detailed DIY guide, we’ll walk through the entire primer bulb replacement process step-by-step, with tips for identifying when a new bulb is needed, choosing the correct replacement part, safely accessing the old bulb, installing the new one, testing for leaks, and getting your small engine primed and ready to start again.

Introduction – What is a primer bulb and why do they need replacing?

Before jumping into the repair, it helps to understand what exactly the primer bulb does. Most small engines for equipment like lawn mowers, snow blowers, chainsaws, lawn trimmers, and generators utilize carburetors rather than electronic fuel injection. Carburetors require priming to draw gas into the carb bowl for cold starting.

The primer bulb acts as a manual pump to pull fuel from the gas tank through a supply line and into the carburetor. Pushing the bulb creates suction that draws the gas through. Come starting time, a few pumps of the primer bulb are needed to get the fuel flowing into the carburetor so the engine has sufficient fuel to ignite on first crank.

Over time, primer bulbs experience wear and tear. They can become stiff, crack, develop leaks, or simply stop working effectively at delivering the necessary suction. Any of these issues will make cold starting difficult or impossible. Replacement restores priming performance.

Signs a New Primer Bulb is Needed

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

How can you identify when it’s time to replace the primer bulb? Here are the common signs:

  • Engine won’t start without repeated priming – Having to pump the bulb many times to get the engine started indicates poor suction
  • Stiff, rigid bulb – Lack of flexibility makes it difficult to depress the bulb and create suction
  • Cracked or damaged bulb – Any visible cracking or decaying rubber means replacement needed
  • Fuel leaks – Wetness around the bulb or fuel line connections points to leaks
  • Missing primer bulb – Sometimes bulbs simply break off or disappear altogether

If you spot any of these warning signs, a new primer bulb is in order. The good news is these repair parts are inexpensive and replacing them is a quick, easy job anyone can tackle.

Safety First – Turn Off Fuel Supply and Allow Engine to Cool Before Starting

Any small engine maintenance job requires care to avoid potential hazards. Here are a few key safety steps to take before diving into primer bulb replacement:

  • Shut off fuel valve – Turn the fuel shut-off valve to the “off” position if one is present.
  • Run dry – Start the engine and let it run until all the fuel is used up from the carburetor and lines and the engine dies.
  • Allow cooling – Let the engine cool fully before beginning disassembly to avoid burns.
  • Prevent starting – Remove the spark plug cable so the engine cannot start accidentally during service.
  • Protect skin – Wear gloves to avoid contacting spilled fuel.
  • Work area – Repair outdoors or in a well ventilated area.

With safety at the forefront, you can confidently get to work on replacing the primer bulb.

Locate the Primer Bulb – Usually Found Along Fuel Supply Line Near Carburetor

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

The first step is finding where the primer bulb is located on your particular small engine. While the configuration can vary across different equipment, the primer bulb is most often situated along the fuel supply line somewhere between the gas tank and the carburetor.

Trace the fuel line back from the carburetor along its path to the gas tank. Look for a small plastic bulb with fuel line connections on both ends. It may be connected via clamps or screws. The bulb will likely have an “IN” and “OUT” arrow molded into the plastic indicating the direction of fuel flow.

Take note of exactly how the primer bulb is positioned and connected as you will need to replicate this setup with the new part. Pay attention to which end connects to the gas tank line and which goes to the carburetor. Removing the old bulb exposes the ends of the fuel line for connecting the new one.

Remove Mounting Screws or Clips – Carefully Detach Primer Bulb from Fuel Line

With the primer bulb located, now it’s time to remove it. The exact process depends on the mounting method:

  • Plastic clamps – Squeeze the ends of the clamps to release them from the bulb’s nipple ends. Pull the fuel lines off the old bulb.
  • Metal clamps – Loosen the clamp screws using a flathead screwdriver. Slide clamps off the fuel lines.
  • Screws – Remove any retaining screws that pass through brackets on the bulb. Often phillips-head.

Take care when detaching the bulb from the pressurized fuel system. Pull gently to avoid spilling gas. Removing the bulb exposes the two open ends of fuel line – note which direction they are pointed as you’ll need to connect the new bulb the same way.

Disconnect Old Primer Bulb – Pull Firmly But Gently to Detach from Fuel Line

Here are a few tips for smoothly disconnecting the old primer bulb without leaks or other issues:

  • Catch drips – Have a rag handy to catch any gas that drips out of the line ends.
  • No tools – Pull the bulb off by hand rather than using tools that could damage the line.
  • Check condition – Inspect the ends of the fuel lines for any cracks or deterioration.
  • Seal if needed – A bit of fuel line sealer can help stop any small leaks from the open ends.

The lines themselves should be in good condition to re-use. If the fuel lines are decayed, brittle or cracked, replace them along with the primer bulb.

Install New Primer Bulb – Push Ends of Fuel Line into Ports on New Primer Bulb

Installation of the new primer bulb is the reverse of removal. Most replacement bulbs come with the same style end connectors as the original.

Start by orienting the new bulb so the fuel flow arrow matches the original setup – fuel into the “IN” port from the gas tank line, “OUT” port connected to the carburetor line.

Push the fuel line ends firmly into the corresponding ports on the new primer bulb. They should insert 1/2 to 3/4 inch and “click” into place.

Take care to only push the lines into the correct ports based on the fuel flow direction to avoid reverse installation. Double check everything matches directionally before securing the new bulb.

Secure New Primer Bulb – Reattach Mounting Screws or Clips to Hold in Place

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

With the fuel lines securely inserted into the new primer bulb ports, the final step is re-attaching the bulb into place on the equipment.

If the original primer bulb was held in place with plastic clips, simply squeeze and reopen them over the nipple connectors. For clamps, tighten down the screws carefully and evenly so as not to crush the fuel line ends.

Any retaining screws or brackets that secure the bulb can now be re-fastened. Check that the bulb is oriented properly and connections are tight.

Reconnect Fuel Supply – Turn Fuel Back on and Check for Leaks Around Connections

Once mounted, reconnect the fuel supply valve or tank line and turn the fuel back ON. It’s critical to check for any leaks at the connections on the new primer bulb.

Spraying carb cleaner or soapy water on the joints and watching for bubbles is an easy leak check method. Tighten clamps or reinforce with fuel line sealer as needed to stop any drips or weeping.

Catching fuel leaks now prevents a fire hazard when operating the equipment. Take time to confirm everything seals up before starting the engine.

Test Operation – Pump New Primer Bulb a Few Times to Move Fuel into Carburetor

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

The moment of truth – testing if the new primer bulb performs as intended. With fuel supplied to the lines, depress the bulb several times watching it refill with air each time.

Check that the bulb feels flexible and responsive. It should inflate and deflate smoothly. You may see a small stream of fuel moving through the carburetor throat when priming if the carb bowl is transparent.

Repeat the priming motion until the bulb feels firm, an indication fuel has reached the carburetor. If the bulb remains squishy, a connection may be faulty.

Start Engine – Push Primer Bulb Until Firm Then Pull Starter Cord to Start Engine

If the new primer bulb feels solid after priming, go ahead and try to start the engine. Most small engines require 3-5 pumps of the primer bulb before starting. crank the starter cord briskly.

The engine should kick over and start with less effort thanks to the restored fuel delivery. If not, double check the carburetor and air filter are clean and no other issues are preventing starting.

With a properly connected new primer bulb, cold starting becomes quick and easy again. Just remember to pump the bulb a few times before each engine start-up.

Be sure to run a few tanks of fuel through the engine to break-in the new primer bulb. Keep an eye out for potential leaks developing at the connections. Finally, replace the fuel lines if they appear aged or damaged to complete the repair.

Investing a few minutes into a new primer bulb pays dividends through easy cold weather starts and reliable fuel priming all season long. This straightforward DIY repair restores your small engine’s starting performance.

When it comes to any repair on a gas-powered engine, safety should always be the top priority. Replacing a fuel primer bulb is no exception. Taking the proper precautions upfront prevents injuries and ensures you can complete the repair successfully.

Safety First – Turn Off Fuel Supply and Allow Engine to Cool Before Starting

Small engines pose unique hazards you need to manage during maintenance. Here are some key safety steps to take when replacing a primer bulb:

  • Shut off the fuel – Locate the fuel valve and turn it to the off position. This cuts off the gas supply to the engine.
  • Run the engine dry – Start the engine and let it run until sputtering to a stall. This empties the carburetor bowl and lines of excess fuel.
  • Allow cooling – Let the engine cool fully before starting the repair. Touch testing with the back of your hand checks for heat.
  • Remove spark plug cable – Detach the spark plug wire so the engine cannot accidentally start up.
  • Use protective gloves – Wearing gloves prevents skin contact with fuel and protects from hot engine parts.
  • Have good ventilation – Work in a well-ventilated area to dissipate leaked gas fumes.

Exercise caution when dealing with spilled gasoline – it poses a serious fire hazard. Have a fire extinguisher on hand just in case. Avoid sources of ignition until any spilled fuel has evaporated.

You’ll also want to take steps to prevent the engine from starting accidentally during the repair which could cause injuries. Removing the spark plug cable achieves this.

Finally, letting the engine fully cool before service prevents burns from hot components. Small engines retain heat after shutdown. Allowing adequate cooling ensures you can safely access the primer bulb and fuel system.

With these preliminary safety steps taken, you can move forward confidently with the primer bulb replacement knowing potential hazards are minimized.

When servicing any gas-powered equipment, rushing in without proper preparation often leads to accidents and injuries. But taking the time upfront to address safety considerations like fuel shut off, engine cooling, and spark plug removal reduces those risks substantially.

While eager to get your small engine back up and running, exercise patience. Follow this simple safety protocol to carry out primer bulb replacement or any other repair worry-free and avoid personal harm.

The modest investment of a few additional minutes in safety consciousness makes a huge difference in ensuring you can complete the fix-it job safely while protecting yourself and your equipment.

Locate the Primer Bulb – Usually Found Along Fuel Supply Line Near Carburetor

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Before replacing your small engine’s primer bulb, you first need to locate it within the fuel system. Primer bulbs are positioned along the fuel supply line running from the gas tank to the carburetor.

Here are some tips for tracking down the primer bulb on your particular engine:

  • Follow the fuel line – Trace the fuel line visually from where it connects to the carburetor inlet. Continue following it back toward the gas tank.
  • Near the carburetor – Primers are usually installed within 12 inches of the carburetor for ease of priming.
  • Inline on the tubing – The bulb will be spliced into the rubber fuel line with connections on both ends.
  • Bulb shape – Look for a small plastic bulb shape on the fuel line.
  • Arrows – Primer bulbs have molded “IN” and “OUT” arrows indicating fuel flow direction.

Finding where the existing primer bulb is located allows you to orient the replacement part correctly. Note exactly how the bulb sits in the fuel line so you can replicate the setup.

If you trace the fuel supply tubing and don’t see an inline primer bulb anywhere, it’s possible your engine relies solely on gravity feeding fuel from the tank to the carburetor. Some equipment omits primer bulbs altogether.

Confirm model numbers and parts diagrams to determine if a primer should be present before assuming it’s missing. Spare parts kits will include the bulb if originally equipped.

Engines with primer bulbs often mount them about halfway between the gas tank and carburetor. But positioning can vary. Continue tracing the fuel line from the carburetor back toward the tank until you locate the bulb.

Primers are vital for drawing additional fuel into the carburetor to aid cold starting. Make note of the bulb’s exact position and orientation before detaching it for replacement. This ensures installing the new part in the proper inline location and fuel flow direction.

Taking a few minutes upfront to precisely locate the primer bulb saves headaches down the road. You’ll have a clear blueprint for reconnecting the replacement bulb quickly and correctly.

Remove Mounting Screws or Clips – Carefully Detach Primer Bulb from Fuel Line

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

With the old primer bulb located, it’s time to remove it from the fuel line. Primer bulbs are secured in a variety of ways depending on the engine model.

Here are some of the most common mounting methods and how to detach them:

  • Plastic clips – Squeeze the tab on the clips to release their grip from the bulb’s nipple ends.
  • Metal clamps – Loosen the small screw on the clamps to slide them off the fuel line.
  • Retaining screws – Remove any screws passing through the mounting bracket or bulb flange.
  • Friction fit – The bulb may simply be pressed/pulled off the fuel line ends, no fasteners.

Carefully detach the bulb from the fuel line using your hands only. Avoid using metal tools which could damage the line. Work slowly and gently to avoid spilling gasoline.

As you remove the bulb, take note of which line connects to which port so you can replicate this later. Most primers have an inbound “IN” port and outbound “OUT” port.

Check the condition of the fuel lines after removing the bulb. Make sure the ends are not cracked or deteriorated. Replace any damaged sections of fuel line before installing the new primer.

If the lines appear in good shape, you may wish to put a dab of fuel line sealer on the open ends to prevent leaks. Then set aside the detached primer bulb and get set to install the new replacement.

With the old bulb removed, take a minute to clean any debris from the fuel line ends. This prevents contamination from entering the new primer or carburetor. Then you’ll be ready to mount the fresh bulb.

Removing the original primer bulb takes a delicate touch. Avoid haste and work gingerly to protect the integrity of the fuel lines. Patience prevents leaks or other issues from cropping up during installation of the new part.

Disconnect Old Primer Bulb – Pull Firmly But Gently to Detach from Fuel Line

With the primer bulb detached from the mounting clips or screws, it’s time to disconnect it from the fuel line tubing. This involves gently working the bulb free from the line ends.

Here are some tips for smoothly removing the old primer:

  • Work by hand – Don’t use tools, pull the bulb off manually to avoid damage.
  • Rock softly – Carefully rock the bulb side-to-side while pulling outward.
  • Check flow arrows – Make sure you are disconnecting in the right direction.
  • Have a rag handy – Catch any drips of gasoline as the bulb comes free.
  • Inspect lines – Look for cracked or deteriorated ends on the fuel line.
  • Seal if needed – Apply fuel line sealer to the open ends to prevent leaks.

Take a slow and gentle approach when disconnecting the old primer bulb from the fuel lines. The plastic nib ends can crack if pulled too forcibly.

Work the bulb gently back and forth while pulling lightly outward at the same time. The nib ends will eventually slide out of the fuel line. Catch any drips of gasoline with a clean rag.

Check that the fuel line ends are in satisfactory condition with no deterioration or cracks. It’s also a good idea to temporarily seal the open ends to prevent leaks or contamination.

Be sure to disconnect the bulb in the proper fuel flow direction – don’t accidentally detach the “IN” side from the tank line for example. Trace the arrows to pull correctly.

With the old primer bulb removed, the fuel line ends are now prepped and ready for installation of the new replacement bulb. Just take care not to bend or kink the line tubing during removal.

Patience and a gentle approach prevents damage when disconnecting the original bulb. Avoid haste and work gingerly until the bulb releases from the line ends smoothly and cleanly.

Install New Primer Bulb – Push Ends of Fuel Line into Ports on New Primer Bulb

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

With the old primer bulb removed, it’s time to install the new replacement unit. This involves securely connecting the fuel lines into the ports on the replacement bulb.

Here are some tips for properly mounting the new primer:

  • Match flow direction – Connect lines to the “IN” and “OUT” ports correctly.
  • Push firmly – Insert the fuel line ends into the ports 1/2 to 3/4 inches.
  • Listen for click – Lines should click into place and resist pulling out.
  • Don’t force – Avoid excessive force, stop if line does not seat fully.
  • Confirm fit – Lightly tug lines to confirm they are locked into the ports.

When pressing the fuel lines into the ports on the new primer bulb, take care to match the flow direction. The tank line should insert into the “IN” port, carburetor line into “OUT” port.

Push the line ends fully into each port until resistance is felt. You should hear an audible click as the retainers on the bulb lock over the line ends. Confirm the lines are firmly seated by gently tugging on them.

If a line does not seem to be connecting into a port fully, don’t force it. Remove and re-examine the line end and port for obstructions before carefully re-inserting.

Visually inspect the connections to ensure the fuel line nib ends are correctly oriented and fully inserted into the primer bulb ports. Proper installation prevents leaks and maintains fuel flow.

Take a moment to double check the flow direction with the molded arrows on the new primer. This prevents accidental reverse installation that hampers performance.

With care taken to properly connect the fuel lines into the replacement bulb ports, you can move on to securely mounting the new primer into place.

Secure New Primer Bulb – Reattach Mounting Screws or Clips to Hold in Place

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Once the fuel lines are inserted into the ports on the new primer bulb, the next key step is securely mounting the bulb back into position on the equipment.

Here are some tips for properly securing the new primer bulb:

  • Replicate original – Mount the new bulb the same as the old one.
  • Plastic clips – Compress clips and slide over nib ends of bulb.
  • Metal clamps – Position clamps and tighten screw gently but firmly.
  • Retaining screws – Refasten any brackets or screws as originally installed.
  • Check snugness – Confirm bulb is held tightly with no looseness.

In most cases, the replacement primer bulb will mount in the same fashion as the original. Whether plastic clips, metal clamps or retaining screws, reuse the same fasteners in the original locations.

When using plastic line clips, compress the clip to open it and slide over the bulb’s nib end. Position the clip in the same spot as before and release to secure the line.

For metal line clamps, loosely position the clamp then tighten the screw just enough to hold the line end. Avoid over-tightening and crushing the fuel line.

Refasten any brackets or retaining screws that were removed earlier. Check for tightness, but take care not to strip the screw heads.

With the bulb re-secured, give it a gentle tug to confirm there is no looseness or rotation. It should remain firmly anchored in the correct position.

Proper mounting prevents leaks, damage and poor priming performance. Taking care to correctly fasten the replacement bulb maintains the integrity of the fuel system.

Reconnect Fuel Supply – Turn Fuel Back on and Check for Leaks Around Connections

Once the new primer bulb is securely installed into the fuel line, the next step is to restore the fuel supply and check for any leaks.

Here are some tips for this critical step:

  • Slowly open fuel valve – Rotate valve gradually to begin fuel flow.
  • Watch connection points – Scan bulb and line joints for any drips or weeping fuel.
  • Spray with carb cleaner – Bubbles will reveal leaks as fuel evaporates.
  • Make adjustments – Tighten clamps or reseat lines to stop leaks.
  • Confirm no leaks – Verify zero fuel leaks before starting engine.

Carefully turn the fuel valve back to the open position. Open it slowly and only partially at first to begin reintroducing fuel into the primer bulb and lines.

Closely inspect all the connection points on the new primer, watching for any drops or drips of gasoline. Leaks most often occur at the joints.

Spraying carburetor cleaner on the areas bubbles up as fuel leaks out. This helps pinpoint the exact leak location so it can be corrected.

If leaks are spotted, try tightening the line clamps evenly and firmly or check that the line ends are fully seated in the ports. Add fuel line sealer if needed.

Confirm 100% that all leaks are resolved before attempting to start the engine. Fuel leaks pose a significant fire and explosion hazard.

Properly reconnecting the fuel supply and rigorously checking for leaks ensures safe operation of your small engine. Patience in this step pays dividends.

Test Operation – Pump New Primer Bulb a Few Times to Move Fuel into Carburetor

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Once the new primer bulb is installed and fuel lines reconnected, it’s time to test out the repair by priming the carburetor.

Here are some tips for confirming proper operation:

  • Pump bulb several times – Press and release bulb to draw fuel.
  • Check bulb refills – Release bulb and verify it inflates again with air.
  • Listen for fuel flow – You may hear gas moving through carburetor.
  • Feel for firmness – Repeated priming will make bulb stiff.
  • Inspect carburetor – Fuel should be visible rising in transparent bowls.

Begin testing by pumping the new primer bulb 5-10 times. You should feel resistance as you depress the bulb to push fuel through the line into the carburetor.

Make sure the bulb fully re-inflates with air each time you release it. This confirms the check valves inside are working correctly to draw fuel.

You may hear the gasoline flowing into the carburetor throat after several primer pumps. Visible rising fuel inside see-through carburetor bowls confirms flow.

The bulb will begin to feel stiff and firm after repeated priming as fuel reaches the carburetor. If not, a connection may be faulty.

By pushing the new primer and verifying fuel movement to the carburetor, you can confirm all connections are secure before attempting engine start.

Take the time to test operation – it’s cheaper to fix leaks and issues now versus damage after starting the engine with problems.

Start engine – Push primer bulb until firm then pull starter cord to start engine

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Replacing a worn out or damaged fuel primer bulb is an easy fix that can get your small engine up and running again. With just a few tools and a new primer bulb, you can have your lawn mower, snowblower, chainsaw or other equipment starting right up. This straightforward repair is something even novice DIY-ers can tackle successfully.

A primer bulb acts like a choke, helping get the engine going on first startup. You push the bulb to shoot a spurt of gas into the carburetor and enrich the fuel mixture, allowing for faster cold starting. Over time, the heat and pressure make the rubber bulb crack or develop holes, requiring replacement.

Luckily, fuel primer bulbs are inexpensive parts available at hardware and home improvement stores, as well as online retailers. Typically less than $10, they come in universal styles made to fit most small engines. You’ll need to know the mounting type – horizontal or vertical – and measure the diameter to find the correct replacement.

Gather Necessary Tools and Supplies

Replacing a primer bulb only requires a few basic tools and a new bulb.

  • Set of small screwdrivers
  • Needle nose pliers
  • Replacement primer bulb (match diameter and orientation)
  • Socket wrench (for some applications)

You may also need a little carburetor cleaner to prep the area. Ensure you have all tools on hand before getting started.

Disconnect Power Source and Fuel Line

Safety first! Before doing any small engine work, disconnect the spark plug wire and remove other power sources like batteries. This prevents any risk of accidental startup while working.

You’ll also need to detach the fuel line from the carburetor where it connects to the primer bulb. On some models, there is a small clip; other types have a screw clamp. Use needle nose pliers to compress the clip or a screwdriver to loosen the clamp. Pull the fuel line off the carburetor nipple.

Place an empty canister under the carburetor to catch any gas drips. Wipe up any spilled fuel as this is a fire hazard.

Remove Old Primer Bulb

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

With the fuel line detached, you can now work on removing the old primer bulb. There are a few different methods depending on the style.

Twist Lock: Common on Universal and Walbro primer bulbs, these have small locking tabs that secure the bulb. Use a flat head screwdriver to gently pry up and twist the tabs to release. The bulb will then pull off easily.

Pinch clamps: Squeeze together the metal arms on pinch clamps with pliers and slide the bulb out. You may need to carefully pry the clamp arms loose if they are stuck.

Screws: Some primer bulbs mount with small screws into threaded holes. Use the appropriate size screwdriver to remove the screws and release the bulb.

Inspect the vacuumed side of the carburetor (opposite the fuel inlet). Clean any dirt, old fuel or debris with carb cleaner and a small wire brush or pipe cleaners. You want a clean surface for the new primer bulb to seal against.

Install New Primer Bulb

Check that the new primer bulb matches the mounting style and diameter of the old one. Test fit it first without attaching the fuel line. Ensure the bulb seats properly into the carburetor.

Most primer bulbs are universal parts able to fit multiple applications. You may need to cut or trim any excess plastic from the fuel barb to properly fit your engine.

Once you have confirmed fitment, go ahead and push the fuel line back onto the new primer bulb’s barb. Secure with the clip or clamp. Make sure the connection is tight and properly sealed.

Remount the primer bulb using the appropriate method for your model:

  • Twist lock – Align locking tabs on bulb with slots on carb. Push in gently while turning to engage tabs.
  • Pinch clamp – Open clamp arms and install bulb. Squeeze clamp closed over neck of bulb.
  • Screws – Thread screws into carburetor holes to secure bulb.

Visually inspect your work and give the primer bulb a few presses to check function.

Restart Engine and Check for Leaks

How to Replace A Fuel Primer Bulb on Your Small Engine: A Step-by-Step Guide for Success

Reconnect the spark plug wire. If previously removed, reinstall the battery. Add fresh fuel to the tank and prepare to start the engine.

Press the new primer bulb 6-8 times until slightly firm. Then pull the starter cord with a rapid motion. The engine should start right up with the help of the fuel enriching primer bulb.

Let the engine run for a minute or two while watching and listening closely for any leaks. Spraying or dripping fuel indicates the connections need to be tightened. Immediately turn off the engine if you detect leaks.

If no leaks are present, the new primer bulb is working correctly! You can now enjoy easy cold starting thanks to a properly operating fuel primer bulb.

With a few basic tools and mechanical skills, you can save money on small engine repairs. Replacing a damaged fuel primer bulb is well within the capabilities of a motivated do-it-yourselfer. Just take your time, follow safe practices, and refer to the steps in this guide. You’ll have your equipment starting smoothly again in no time.