Posted by TimWafer on July 12, 2018 at 11:17:44 from (98.21.118.93):
I have a 18HP Briggs vanguard #350447 in a UTV that surges at higher throttle or under load. Ive removed disassembled and cleaned the carb by soaking in carb cleaner, blowing it out with compressed air and putting it in an ultrasonic cleaner. Also using aerosol carb cleaner.
Ive replaced the fuel filter (& air filter) but the same issue remains. Adding a little choke to it while it does this seems to help. Its driving me nuts. It just seems like its starving for fuel. I was thinking of trying a temporary fuel tank above the motor so its gravity fed and see if that makes a difference. That would eliminate the fuel pump.
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