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Gas in oil

#1

K

kenneth2

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?


#2

T

txmowman

Check the short pulse line to the fuel pump. If there is evidence of fuel in the tube, the diaphragm is ruptured. Otherwise replace the float valve. No need to replace the carburetor.


#3

Tiger Small Engine

Tiger Small Engine

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?
Click to expand...
Remove carburetor and clean. Inspect and test needle and seat. Install fuel shut valve for added protection if desired. Could be as simple as some debris caught between needle and seat.


#4

K

kenneth2

Thanks for reply’s, cleaned needle and seat. Thinking they may be old and dry. Aftermarket carb cheaper than factory needle valve, maybe I will swap parts. Also how do I delete a post. I posted same message twice.


#5

T

txmowman

If you can buy a carburetor for less than the cost of a float valve, $18, I would be leery.
Also, there is no FS548V engine. FS541V maybe?


#6

StarTech

StarTech

There is no such fs548v. Please post the correct engine info.


#7

K

kenneth2

Yes fs541v, sorry


#8

S

slomo

kenneth2 said:
Leaning on a new aftermarket carb.
Click to expand...
Why? Clean the one you have first. Might need a new needle and seat if the cleaning doesn't help. I would put an inline fuel shutoff valve on her if it was mine.
kenneth2 said:
Was thinking possibly fuel pump.
Click to expand...
Why? You have more than enough fuel reaching the carb.
kenneth2 said:
Is there a way to test with a vacuum pump?
Click to expand...
Finger or vacuum gauge? Cigar or smoke machine?

Fix the carb issue before using the machine. Do a couple oil dumps. Oil is cheap, engines are not.


#9

K

kenneth2

Yeah all set now. Carb is cleaned and all good for a week now


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