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Hi
I have a 15 year old Lawn boy walk-behind mower that will run for 3-5 minutes and then dies. I pushed the bulb that feeds gas to the carburetor (No Choke) and it does run for a few more minutes. I have removed the float bulb, flushed out the gas, and that made it run for about 30 minutes. Now it's back to 3-5 minutes. It is a Tecumseh Products, ENGINE FAMILY- YTPXS.1851BA DISP 185CC. The name on the fly wheel cover is SILVER ELECTRIC START, 5.0 hp. It's a 21 inch mower.
Rather than changing parts I thought I would run it by you guys to any expert advice you can give me.
Colly43

The fuel cap vent may be plugged, creating a vacuum in the tank, or the float is sticking. Try soaking the fuel cap in water and dish soap for a few minutes. If that fails, the carburetor will likely need to be replaced with an OEM. What is the model of the Mower? Also, that is not the engine model; it should be something like LEV185xxxxxx

kbowley said:

The fuel cap vent may be plugged, creating a vacuum in the tank, or the float is sticking. Try soaking the fuel cap in water and dish soap for a few minutes. If that fails, the carburetor will likely need to be replaced with an OEM. What is the model of the Mower? Also, that is not the engine model; it should be something like LEV185xxxxxx

Click to expand...

Clean existing OEM carburetor.

Thanks for input. I did the soap and water on the cap and that didn't help. Also unscrewed the cap as the engine was dying and that didn't help. I attached the engine tag as I cannot find any other information on the mower, except on flywheel cover noted above. I will pull the carb tomorrow and use Gum-out. How do I fix a sticking float? I had the sediment bowl off earlier and the float was moving freely.

Please the model and serial numbers off the silver ID tag located on the rear of the deck. This will help us better see which engine you are dealing with.