Question: Why Does My Lawnmower Start But Not Stay Running?

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

The problem is that the carburetor is restricted or plugged and needs to be cleaned and rebuilt with a COMPLETE carburetor repair kit.

Here is my comprehensive carburetor and fuel answer that may give you some ideas.

And they call it “Oxygenated fuels.


How do you fix a clogged carburetor?

Clean your Carburetor in 10 Simple StepsStep 1: Remove the spark plug cap so the engine doesn’t fire. … Step 2: Next, drain the fuel. … Step 3: If the carburetor bowl has a sticky residue in it, spray the inside with carburetor cleaner and wipe it clean. … Step 4: The main jet’s passage is where fuel flows through the carburetor into the combustion chambers.More items…

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.

How long to wait if lawnmower is flooded?

15 to 20 minutesUnless you’re in an incredible hurry, you need take no action to correct a flooded lawnmower engine. Simply settle the mower on a level surface, wait 15 to 20 minutes to allow the gasoline to evaporate and try starting the mower again without engaging the choke.

What can I spray in my carburetor to start my engine?

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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.

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

Even when fuel is in the lawnmower, the engine may sputter and stop during use if the fuel level is too low. Dirty or old fuel can cause problems as well. Many homeowners own fuel-powered trimmers, blowers and other tools that require a mixture of gasoline and two-cycle oil.

How do you fix lawn mower that starts then dies?

If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine.

How do I know if my lawnmower spark plug is bad?

A few symptoms provide clues that it’s time to change a spark plug.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. … Poor Engine Performance. … Excessive Fuel Consumption. … Physical Appearance.

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.

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.

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

However, you can not spray the carburetor when the engine is off since it cannot do the cleaning without being propelled. All you need to do is to start the engine and spray directly at the center of the carburetor while it is running. Any deposits clogging in the carburetor will easily be removed.