Regan Brown
If your lawnmower has been sitting for a while and won't start, you may need to prime the fuel line. Priming is necessary when fuel in the carburetor has evaporated. This process is generally the same across different lawnmower manufacturers. It involves putting gas into the carburetor float bowl to start the lawnmower engine. Most lawnmowers have a soft plastic or rubber bulb to push gasoline into the carburetor. This can be done manually, or by squirting gas into the throttle bores or carb vents.
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What You'll Learn
How to prime a lawnmower carburetor
If your lawnmower has been sitting for a while, the fuel in the carburetor may have evaporated, causing the engine to refuse to start. Priming the carburetor is a way of putting some gas into the carburetor float bowl to start the lawnmower engine.
Most lawnmowers have a soft plastic or rubber bulb to push gasoline into the carburetor. To prime the carburetor, first, remove the cap from the lawnmower fuel tank. Fill the tank with gasoline and replace the cap. Locate the primer bulb on the side of the lawnmower engine. The primer bulb is usually red and located under the carburetor. Press and release the primer bulb three times with your finger to prime the lawnmower's carburetor.
If your lawnmower does not have a primer bulb, you can still use the mower by employing an alternative method for priming the carburetor. Pull the cover off the air cleaner mounted on the side of the mower engine. In most cases, the air cleaner cover attaches with a small retaining clip. In some cases, you must remove a screw to take off the cover. Take note of the air cleaner positioning inside the air cleaner housing, and then remove the air cleaner from the housing.
You can also try squirting gas into the throttle bores for about 15 seconds while someone starts the engine. Alternatively, fill the carburetor manually through the vents with a small squirt bottle filled with gas. Pump until you see the accelerator pump squirt and then fire it up.
Once the carburetor has been primed, pull the throttle lever on the lawnmower handle to the "fast" position. Grab the pull rope with one hand and pull it slowly until you feel resistance. Hold the throttle bar against the lawnmower handle and pull sharply to start the engine. It may take several attempts to start a cold engine. If the engine does not start after three pulls, reprime the carburetor.
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Using a squirt bottle to prime the fuel system
To prime your mower's fuel line using a squirt bottle, you'll need to take a few important steps to ensure safety and effectiveness. Here's a detailed guide to help you through the process:
First, it is important to choose an appropriate squirt bottle for your fuel. Look for a bottle that is specifically designed to hold flammable liquids, such as a chemical-resistant bottle made from thick-walled aluminium or plastic. These bottles are often coloured to indicate they contain fuel and have solvent-resistant caps and seals. Avoid using a simple water bottle, as it may not be safe or give a professional appearance.
Next, fill your chosen squirt bottle with the appropriate fuel for your mower. This could be gasoline or a mix fuel, depending on your mower's requirements. Ensure you are in a well-ventilated area and take the necessary precautions when handling flammable liquids.
Now, locate the throttle bores or the carb vent tube on your mower. Squirt the fuel into these areas for around 15 seconds. You may need to have someone assist you by trying to start the mower while you're squirting the fuel. This method will help prime the fuel system and get the engine to start.
Alternatively, you can manually fill the carburettor through the vents. Remove the line going into the carburettor and squirt fuel directly into the vent tubes. Pump the primer bulb until you see the accelerator pump squirt, then start the mower. This method ensures the carburettor is filled with fuel, aiding the priming process.
If you're having trouble getting fuel to the pump, you can try applying very light pressure to bring fuel through, thus reducing the amount of cranking needed. Another option is to use carb spray into the carburettor before cranking to help get the engine running.
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Bleeding air from the fuel line
Park your mower on level ground and engage the parking brake. It is important to work on a flat surface to ensure the fuel flows smoothly and doesn't cause any spillage. Locate the fuel injection pump, typically found near the fuel tank or between the tank and carburetor. Identify the fuel lines and ensure they are properly clamped and connected.
If your mower has an electric fuel pump, the process is relatively straightforward. Turn the key to the "RUN" position but do not start the engine. Allow the pump to run for a few minutes to prime the fuel system. This will help draw fuel through the lines and bleed any air present.
For manual fuel pumps, you have a few options. One method is to use a small squirt bottle filled with gas. Squirt gas into the throttle bores for about 15 seconds while attempting to start the engine. This should prime the fuel system and clear any air bubbles. Alternatively, you can manually fill the carburetor through the vents with gas, ensuring you don't overflow.
If you want to prime the pump directly, you can remove it with the lines still attached and pump it by hand. You can also pressurize the fuel tank with compressed air to push fuel through the lines and bleed any air. Always exercise caution when handling flammable liquids and ensure proper ventilation.
Additionally, check for any damage to the fuel lines, such as cracks or cuts, as these can introduce air into the system. Replace the fuel lines if necessary, ensuring a tight fit to prevent air ingress.
By following these steps, you can effectively bleed air from the fuel line of your mower, ensuring optimal engine performance.
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Checking for hairline cracks and other damage
Locate the Fuel System Components: Begin by locating the fuel valve, which is often located at the base of the gas tank where the fuel line connects to the tank. The fuel pump is typically mounted near the carburetor, near the fuel tank or between the tank and the carburetor.
Turn Off the Fuel Valve: If your mower has a fuel valve, turn it to the "off" position. This will prevent fuel from flowing during your inspection.
Clamp the Fuel Line (If No Fuel Valve): If your mower doesn't have a fuel valve, you'll need to clamp the fuel line to stop the flow of gas. This can be done by loosening the mounting screws and using a fuel line clamp.
Remove the Pump: With the fuel flow stopped, you can now remove the pump from the mounting bracket or carburetor. Loosen any mounting screws and carefully take out the pump.
Inspect for Hairline Cracks and Damage: Before disassembling the pump, carefully inspect its external surfaces for any hairline cracks or other signs of damage. Pay close attention to the areas where the fuel line connects to the pump and carburetor.
Disassemble and Clean (If Necessary): If you notice any hairline cracks or damage, it's important to discard the pump (if it has a metal body) and perform a fuel pump replacement. If there is no damage, you can proceed with disassembling the pump for cleaning. Soak metal parts in an all-purpose parts cleaner for up to 15 minutes.
Check Hoses and Replace Faulty Parts: In addition to checking the pump, inspect the hoses for any signs of cracks, softening, or hardening. Replace any faulty hoses or other components, such as gaskets, diaphragms, and springs, with parts from an original manufacturer's repair kit.
Remember, if you notice any hairline cracks or damage to the fuel tank itself, do not attempt to repair it. A compromised tank should be replaced to ensure your safety when operating the mower. Always refer to your mower's owner's manual for specific instructions and safety precautions related to your particular model.
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Troubleshooting a cold lawnmower engine
Check the Basics
First, ensure you have enough fuel and that it is fresh. Stale, untreated gas can break down over time, leading to engine damage. If you suspect your fuel might be stale, drain it and replace it with fresh gas and a fuel stabilizer. Also, check your oil level and appearance, topping it off if necessary.
Spark Plug and Ignition System
Check that your spark plug is functioning correctly and that the spark plug gap is set properly. An improper spark plug gap can lead to engine knocking and poor performance. If your spark plugs look good, the problem could be with other components of your ignition system, such as the spark plug lead or kill switch.
Carburetor and Air Filter
If your engine is emitting black smoke, it could indicate that your carburetor is flooded or that your air filter is dirty. Check your air filter and, if necessary, clean or replace it. You may also need to replace your carburetor if it is not functioning properly.
Compression Issues
If your engine is hard to start when cold but runs well once it warms up, it may be due to compression issues. While lawnmower engines are built for reliability rather than high performance, it is still worth checking for any signs of wear and tear on the piston rings and other components.
Priming the Fuel Line
If you suspect that your fuel line is not delivering fuel properly, you can try priming it. One method is to use a small squirt bottle with gas and squirt it into the throttle bores while someone attempts to start the engine. Alternatively, you can fill the carburetor manually through the vents, or remove the fuel line from the carburetor and pump it by hand to prime the pump.
Safety First
Always consult your engine and equipment manual before attempting any troubleshooting or repairs to ensure you are following the correct procedures and staying safe.
By following these steps and instructions, you should be able to get your cold lawnmower engine running smoothly again.
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Frequently asked questions
Priming a mower fuel line is necessary to start a mower that has been sitting for a while, as the fuel in the carburetor evaporates over time.
If your mower engine doesn't start after a few pulls, especially if it has been sitting for a few months, it likely needs to be primed.
You will need a source of gas/fuel, and possibly some basic tools like needle-nose pliers and duct tape, depending on the method used.
The basic process involves adding gas to the carburetor float bowl, either by using a primer bulb (if your mower has one) or by manually adding gas through the vents. Refer to your specific mower model instructions for detailed steps.
Yes, there are a few alternative methods. You can run a separate fuel line to the pump suction from a gas can and use low air pressure to push the fuel through, or you can remove the pump and manually pump it with the lines still attached.
