How to fix a lawn mower fuel pump

As anyone knows who has had experience with gasoline engines, a fuel pump performs a vital function in keeping the engine running properly. Without an efficient fuel pump, your mower’s engine will run rough or not run at all. The cause of fuel pump inefficiency will usually be a clog or damage to the pump. In any case, you should be able to repair the pump in less than two hours. By following the steps below, you will be able to unblock your fuel pump, repair it or replace it, and you will soon have your mower running like new.

Step 1: location of the pump

You can quickly locate the fuel pump. It has two small rubber tubes attached. One connects to the gas tank and the other to the engine carburetor. The pump will be mounted on the mower, near the gas tank. In some lawnmowers, the pump is powered by an electrical current. If you find an electrical cord attached to the pump, the pump is most likely one that runs on electricity. If so, you should use a voltmeter to verify that you are receiving electrical power.


Step 2 – Test the pump

Before assuming that your mower’s fuel pump is faulty, you should run a quick test. To do this, disconnect the fuel line from where it is connected to the mower’s carburetor. Turn on the power supply and check for gas coming out of the fuel line. If not, the problem is most likely with your fuel pump.

Step 3 – Inspect the pump

Remove the pump from the mower, using a wrench or pliers, and a screwdriver. Disassemble the pump by carefully removing the screws that hold its parts together. Be careful not to damage the seals or gaskets. Once you have the pump open and can see its various parts, look for damaged, broken, or bent parts. Next, look for foreign materials such as sand or gasoline resin deposits that could be obstructing the operation of the pump. If you find deposits of resin (a brown color), spray the surfaces with resin solvent and let it sit for 10 minutes to dissolve the resin. Then wipe the resin with a clean cloth. Remove sand or debris particles with a small soft cloth or brush.

Step 4: reassemble the pump parts

Replace the pump parts, replacing any gaskets or seals that have come loose. If the gaskets or seals are damaged, they must be replaced before completing the assembly of the pump parts. Connect the pump to the mower and connect the electrical cables and all fuel lines except the one between the pump and the carburetor.

Step 5 – The final test

Follow the same procedures that you used previously to test the pump. Once you’ve turned on the pump power supply and can see fuel being pumped from the separate fuel line, you know your repair job was successful. Finally, replace the fuel line used for testing and start your mower.

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