Rajan Wilcox
A clogged lawn mower fuel line can be a headache, causing your machine to sputter and fail to function properly. Luckily, unclogging it is a straightforward process that can be done as part of your routine maintenance schedule. In this article, we will guide you through the steps to get your lawn mower back in working order, from identifying the cause of the clog to safely clearing the fuel line and preventing future clogs. We will also discuss when it's best to call in the professionals for more complex repairs. So, whether you're a seasoned pro or a first-time mower owner, read on to learn how to tackle a clogged fuel line with ease.
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What You'll Learn
Drain the fuel tank
Before you begin to drain the fuel tank, it is important to take the necessary safety precautions. Protect your eyes with safety glasses, so that if your fuel line is cleared, the fuel doesn't spray into your eyes. Disconnect the spark plug to prevent the lawnmower from turning on accidentally while you work on it.
Now, to drain the fuel tank, you will need to locate the fuel valve. This is usually at the base of the gas tank, where the fuel line meets the body of the tank. Turn the valve to the "off" position. If your lawnmower does not have a fuel valve, you will need to clamp the fuel line to stop the gas flow.
The next step is to remove the mounting screws and pump from the carburetor. Once these are removed, you can empty the fuel line. Be sure to check the line with a flashlight to ensure it is not clogged with debris and does not have any holes or cracks. If the tank is damaged in any way, do not attempt to repair it. A compromised tank needs to be replaced to avoid serious injury.
Finally, to drain the fuel, you can either siphon it out or remove the tank mount bolts and pull the line off the bottom. Remember to dispose of the old gasoline properly, following local disposal regulations.
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Disconnect the sparkplug
Disconnecting the spark plug is one of the most important safety precautions you can take when repairing your lawn mower. This is because lawn mowers can start by centrifugal force, which turns the crankshaft and the mower blade until a spark is created that starts the combustion process. You don't want the mower blade to start when you are working on the machine.
To disconnect the spark plug, first, put on some safety glasses to protect your eyes. Then, locate the spark plug. It will look like a small cylindrical metal object sticking out of the engine. It will have a thick wire attached to it, probably with a metal spring clip or a friction fit.
If the wire is attached with a friction fit, gently pull the wire off the plug. If a metal spring clip is holding the wire in place, use some pliers to remove it.
Now, use a spark plug wrench to loosen the spark plug. If you don't have one, you can use a regular socket from a socket set, as long as it fits over the spark plug. Gently turn the plug counterclockwise. Be prepared to turn it a lot, as spark plugs often have long threaded sections.
Finally, remove the rubber "boot" that connects the spark plug to the wire and turn it so the back of the boot is facing the spark plug.
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Check for blockages
Before you begin, it is important to protect your eyes with safety glasses. This will prevent any fuel from spraying into your eyes. You should also disconnect the spark plug to ensure the lawnmower doesn't start accidentally while you are working on it.
Now, check for blockages. First, locate the fuel valve and turn it to the "off" position. If there is no fuel valve, clamp the fuel line to prevent gas from flowing. Next, remove the mounting screws and pump from the carburetor. Once you have done this, you can check the fuel line for any debris, holes, or cracks. Use a flashlight to inspect the line carefully. If you notice any debris clogging the line, you can try to remove it carefully with a suitable tool. However, if the blockage is severe or you are unable to locate the source of the clog, it may be necessary to replace the fuel line entirely.
If your lawnmower has a fuel filter, it is likely to be located in line with the carburetor. Fuel filters commonly become clogged during the mowing season, so it is important to check and replace them if necessary. The fuel filter's job is to remove any debris before the gasoline enters the engine, so make sure to inspect it for any blockages.
In some cases, the issue may not be with the fuel line itself but with the fuel tank. To check this, remove the cap to the fuel tank and inspect it. Look for any signs of sealant or plastic that may have been added and remove any foreign objects if possible. If there is no obvious blockage in the fuel tank, you may need to drain the fuel and replace it with fresh fuel.
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Clean the carburetor
The carburettor is one of the most common culprits for lawn mower stalling, rough running, and inefficient fuel burning. Cleaning a carburettor can feel daunting, but it is well within the capabilities of most DIYers. Here is a step-by-step guide to cleaning your carburettor:
Step 1: Protect yourself and your mower
Before you begin, put on safety glasses and gloves to protect yourself from any fuel spray or spillage.
Step 2: Disconnect the spark plug
Disconnect or remove the spark plug to prevent the lawnmower from turning on accidentally while you work on it.
Step 3: Take reference photos
Take a photo of the carburettor before disassembling it. This will be useful when it's time to reassemble the parts.
Step 4: Remove the cover and air filter
Remove the cover and air filter to access the carburettor. Use compressed air or a brush to clean the filter housing, then wash the filter with a multi-purpose detergent. Rinse and dry the filter thoroughly before reassembling.
Step 5: Unfasten the fuel linkage and detach the fuel line
Unfasten the fuel linkage and carefully detach the fuel line. Have a rag handy to clean up any fuel that spills.
Step 6: Unbolt and disassemble the carburettor
Unbolt the carburettor from the lawn mower. Disassemble the carburettor from the bottom, separating the bowl, float, needle, and main jet.
Step 7: Clean the carburettor parts
Clean the individual parts of the carburettor with carburettor cleaner and a cloth. Ensure you clean all the nooks and crannies thoroughly. Use compressed air and/or a towel to dry the carburettor’s components completely before reassembling.
Step 8: Reassemble the carburettor
Reassemble the carburettor using the photos you took as a guide. Reattach the air filter and outer casing.
Step 9: Test the lawn mower
Reconnect the spark plug and start the motor. Spray carburettor cleaner into and around the centre of the carburettor. Let the mower run for a minute or two.
If your lawn mower is still running poorly after cleaning the carburettor, you may need to drain the fuel and replace it with high-octane fuel. Additionally, consider replacing the spark plug and fuel filter if cleaning the carburettor does not resolve the issue.
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Replace the fuel line
If your lawn mower's fuel line is clogged, you may need to replace it. Before you start, make sure you are wearing protective eyewear. You should also disconnect the spark plug to prevent the lawnmower from turning on accidentally while you work.
To replace the fuel line, you will first need to remove the seat and undo the fasteners that hold the rear body to the frame. Pull this off by lifting it up and back. Next, disconnect the line from the pump and check if fuel flows freely. If it does, the problem is likely with your pump. If not, you can move on to replacing the fuel line.
When purchasing a replacement fuel line, it is recommended to take a section of your old fuel line to your local mower service center and buy a foot of new fuel line, cutting it to size. Before installing the new line, trim it to match the length of the old line. Ensure the new line is not clogged with dirt or particles, as this can cause issues. Install new clamps onto each end of the hose, then install the new hose over the fittings, securing it with the clamps.
Upon first use, check for leaks. If fuel is leaking, stop the engine and re-secure the hose and clamp. If this does not solve the problem, consult an authorized service dealer.
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Frequently asked questions
If your lawn mower sputters and smokes when it should be running smoothly, it may be time to check the fuel system for clogging issues.
First, make sure you are wearing protective eyewear. Next, disconnect the sparkplug to prevent the lawnmower from turning on accidentally. Then, drain the fuel from the tank. If there is a blockage, try to remove it. If you cannot, you may need to replace the fuel line.
Locate the fuel valve and turn it to the "off" position. If there is no fuel valve, clamp the fuel line to prevent gas from flowing. Then, remove the mounting screws and pump from the carburetor and empty the line.
At the beginning of the mowing season, check the fuel system for maintenance, drain the gas tank, and clean the parts.
