Gas in oil

kenneth2 said:
We have had a recurring issue with a Scag 48 with a Kawasaki fs548v engine. Twice it has started to run rough and died. Gas was 3 or 4 inches up in the dipstick and fuel was leaking out of the muffler. Took carb apart and cleaned thinking needle was stuck. Did an oil change and it was fine for a week but has happened again. Compression is even on both cylinders it is only 70 psi but manual says minimum is 65 psi. Leaning on a new aftermarket carb. Was thinking possibly fuel pump. Is there a way to test with a vacuum pump?
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Hello Kenneth,

Fuel is leaking past the needle and seat in the carburetor. Put a shutoff valve in the fuel line to the carburetor and make sure you turn it off every time to shut the mower down. The electric solenoid on the carburetor bowl is also likely stuck open and that will allow excess fuel to constantly flow past the needle and seat.

An aftermarket carburetor is a gamble because it may take 2 or 3 to finally get a good one that will work for even one season. It is best to fully clean and rebuild the original when possible
 
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