Possible carburetor problem? Mower runs for

plugged fuel filter or fuel line?

If the mower is not running and gas is leaking from the carburetor you can be pretty sure that the float/needle valve are not closing off the fuel and the bowl is overflowing.

If the mower has not been running and not properly prepared for storage it will most likely be residue left behind after the gas has evaporated.

Most likely is that the float is stuck to the bottom of the bowl.

follow this steps and fix it. God bless you

Carburetor

If the lawn mower engine stops after a few seconds, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the lawn mower for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.

Carburetor Kit

If the engine stops after a few seconds it may not be getting enough fuel. The engine needs air, fuel and spark to maintain operation. The carburetor has two inputs, fuel from the gas tank and air through the air filter. The carburetor is designed to mix the air and fuel in a consistent ratio so that the engine can run continuously. If the carburetor is not getting enough air or fuel, or if the fuel is blocked inside the carburetor the engine stops after a few seconds. Rebuild the carburetor with this carburetor kit.

Gas Cap

If the lawn mower engine stops after a few seconds and then stops running, the gas cap might be defective. All gas caps have a small vent to allow air back into the tank when the engine is running - otherwise as gas is drawn from the tank it would create a vacuum. The vent can be difficult to see and there are many different types of vent. If loosening the gas cap a little allows the engine to stay running, replace the gas cap. It's sometimes possible to clean the vent, but on most newer engines the vent cannot be cleaned, it should be replaced.

Gas Cap with Gauge

If the lawn mower engine stops after a few seconds and then stops running, the gas cap with gauge might be defective. All gas caps have a small vent to allow air back into the tank when the engine is running - otherwise as gas is drawn from the tank it would create a vacuum. The vent can be difficult to see and there are many different types of vent. If loosening the gas cap a little allows the engine to stay running, replace the gas cap. It's sometimes possible to clean the vent, but on most newer engines the vent cannot be cleaned, it has to be replaced.

Old or Bad Gasoline

If the lawn mower stops after a few seconds, the carburetor might be clogged or have old or bad fuel in the float bowl. If old fuel was left in the lawn mower for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This old or bad fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old or bad fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.

Spark Plug

If the lawn mower engine stops after a few seconds the spark plug might be defective. All small engines have an ignition coil. The coil is the device that provides spark for the spark plug(s). If the coil is bad there won't be spark to the plug(s). The coil is essentially a small, induction generator. It is mounted next to the flywheel. The flywheel has one or more strong, embedded magnets. As the flywheel spins, the magnet(s) zip past the induction coil, this action of a magnet passing past a coil induces a voltage. Depending on the design of the coil and the strength of the magnets, a stronger or weaker spark can be created and delivered to the spark plug(s). Each time the flywheel spins around a spark is generated. The best way to test a spark plug is to use a spark plug tester. The spark plug should have a strong, visible spark between the electrodes when the engine is cranking. If it doesn't, replace it.

Try slackening the fuel filer cap, if the breather is blocked in the cap it will vacume and stop the fuel from flowing, if it runs ok with the cap loose replace the cap.

not getting gas, since gas is going to carburetor then the carburetors float/needle is not working, will need to clean/rebuild/replace carburetor. I am assuming that the mower sat awhile with gas left in it and the gas has gummed up the carburetor, sometimes it will clog the lines,filter and pump, you can use carburetor cleaner to clean it up and you may want to try blow air through the ports, Good Luck Tim

I have a Craftsman mower. Last year I had a similar problem with the mower stopping after running awhile. I noticed that the plastic gas tank was collapsing. The next time it began to stall, I immediately loosened the gas cap and it didn't stall. The vent holes in the cap had plugged up. Check this out.
I can't help you locate the fuel leak, although it sounds like the carburetor float is not stopping gas from flowing into the carburetor.

Ok, so your not getting gas to carberator, or thru the carberator. Disconnect gas line from carberator, if gas is present thru fuel line, you have a carberator problem. Your rather meger with your mower information so this is all i can tell you. Wish i could be of more help.

A few possibilities

1. If engine runs hotter than normal it can eventually heat up the carburetor to the point that there is a vapor lock. Blockage caused by gas bubble: a bubble of vaporized gasoline that blocks the normal flow of fuel. Problem goes away when things cool down. If that is the problem, you need to solve overheating problem. Since you have changed the oil, might be something blocking airflow to the flywheel which has the cooling blades on it. Or cooling blades are filled with debris. Make sure vent hole in gas cap is not blocked

2. Could be bad coil, or condenser causing the windings to act up when they are hot and have expanded they short out (kill engine) on their own casing. After they coil and shrink, they un-short themselves.

possible tank joint or cracked