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

When you prime the engine you are manually adding extra fuel in, so the running issue is most likely related to poor fuel that will not burn unless there is an excess amount present or a fuel deliver issue preventing enough fuel from getting through to begin with.

Do I need to keep pushing the primer bulb?

Your having to push the primer bulb to make it run means it’s running lean. The primer gives the intake a shot of raw gas… First, drain ALL the fuel, including the carb bowl. Then try a small amount of FRESH gas in the tank, and if this doesn’t solve things, clean your carb as suggested above.

Why does my lawn mower 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.

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Why does my lawn mower only start with starter fluid?

Too much starter fluid fill score your cylinder wall. Obviously your engine is not getting enough fuel to start it. First check that your linkage is actually closing the choke completely. IF it appears so, check that there is actually a choke plate attached to the carb choke shaft.

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

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that’s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.

Why does my mower only run on choke?

If your lawn mower only runs with the choke on, check the carburetor. … The carburetor brings air and fuel together and mixes them in the perfect ratio for combustion before they enter the engine. There are several passages in the carburetor that allow fuel to enter the air stream depending how the throttle is set.

What causes a small engine to only run on choke?

When the engine is cold, it needs slightly more fuel in the fuel/air mixture for it to start, which is what the choke does. The choke increases the amount of fuel in the mixture, creating a richer mixture. … So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.

What do you do if your lawnmower won’t 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.

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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.

Is it OK to use starter fluid on a lawn mower?

Use only small-engine starting fluid on a lawnmower, which is available at some hardware stores or any lawn mower repair facility. Standard engine starting fluid is too combustible and will ruin your engine. … Adding starter fluid directly to the engine can help you diagnose why your lawnmower will not start.

What can be used instead of starter fluid?

Premixed gas from lawn equipment, chainsaw, ice auger, any kind of premixed gas will work great. Make sure it’s premix or else it’ll dry out the cylinder walls if it doesn’t start, which isn’t good. And for starting fluid, make sure it has upper cylinder lubricant in it for the same reason to use premix gas.

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