Do you ever wonder why your lawn mower engine revs up and down? The annoying sound that also affects the power your lawn mower puts out is caused by a fuel delivery or vacuum leak issue.
The engine gets enough fuel and then it doesn’t and so on and so forth. After a while the mower will develop a more serious engine problem and may begin to hard start or not even start at all. The surging could also become worse and the swings between high and low will get longer in duration.
This is a problem that is best suited for a lawn mower engine specialist to check out. Our Locations page has a listing of lawn mower repair shops in your area to help resolve this problem for you.
You can check the easy things such as slightly cracking the gas cap to see if the surging stops or change or clean the fuel filter if it has one. Some fuel filters are in the tank and not easy to see. You may have to drain the tank and then flush it out.
The other items are the carburetor and gaskets. Fuel lines can be the culprit too. Systematically check these items for blockage and air leaks to find the cause of the problem.