Why does my lawnmower start but not stay running?

A full gas tank and oil reservoir are the essential first steps when checking why the lawn mower won’t stay running, but the problem could also be a dirty filter, clogged carburetor, improper fuel mixture, or a dirty spark plug. … However, you may need a lawn mower specialist to get you back to trimming your grass.

Why does my lawn mower stop running after a few minutes?

Most lawnmowers have a vented gas cap. The vent is a check valve that allows air into the fuel tank but keeps gas fumes inside. … After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die.

Why does my electric lawn mower only run for a few seconds then dies?

Battery. The most common reason why a cordless mower battery stops working is due to not being charged enough, or it has reached the end of its life. A good electric mower battery should last a long time if cared for properly.

Why does the lawn mower keep stopping?

A clogged air filter can cut off the required air supply to the lawnmower’s carburetor and cause the engine to stop repeatedly. Read the lawnmower’s owner’s manual if you’re not sure how to access the air filter, and check whether or not the air filter is blocked by dirt or other debris.

Why does my riding lawn mower keep dying?

Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine. … If the hole is restricted, the cap bent or the seal under the cap damaged, the engine may be getting too much or too little fuel. Replace the cap to solve sputtering and dying.

Why does my lawnmower overheat and shut down?

Reasons for an engine to overheat and shut down include debris clogging the area around the engine, low coolant levels, a problem with the oil, or an engine mechanical breakdown.