Quick Answer: Why Does My Lawnmower Start Then Shut Off?

Why does my lawn mower start but not stay running?

Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten.

Dirty Air Filter: Clean or replace.

Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas.

If this doesn’t work, you might need a new fuel filter..

Why does my lawn mower sound like it’s turning off?

Check and clean the vent. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine. Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline.

How do you clean a carburetor on a lawn mower without removing it?

How to Clean a Carburetor on a Lawn Mower without Removing it?3.1 What Tools Do You Need?3.2 Step #1: Assess the Situation.3.3 Step #2: Expose the Insider Part of the Carburetor.3.4 Step #3: Spray the Aerosol Cleaner.3.5 Step #4: Remove the Deposits.3.6 Step #5: Replace the Carburetor Cover and Linkage.

Why is my lawn mower running rich?

Poor compression results in an inability to draw in fuel making for lean running condition, or won’t start, won’t stay running condition. If too much compression, then engine is hard to start. I don’t have either of those problems. The other possible reason for running rich is a stuck needle or float issue.

Why does my mower only run when I push the primer?

Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched. and is allowing too much air into the combustion chamber. Inspect the fuel lines for cracks or loose connections.

How do I clean a small engine carburetor without removing it?

Spray with the aerosol cleaner As I’ve told you earlier, you’ve got to have a good and quality carburetor cleaner aerosol spray to clean it thoroughly; this is where it’s going to be used while cleaning your carburetor without removing it.

How do I know if my lawn mower spark plug is bad?

Hard Start The most common problem associated with a bad spark plug in a lawnmower is that the mower is more difficult than normal to start. A push mower may take several more pulls on the starter rope before its engine starts, and a lawn tractor fails to start with the turn of its key.

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

It could be from a dirty carburetor, a malfunctioning spark plug, insufficient flow of gas to the engine or a clogged air filter. But if your lawn mower starts then dies, the causes could also be the same. The most common cause of why a lawn mower starts then dies can be due to a carburetor problem.