I had this problem on my onan 5500, replaced both fuel filters (1 before fuel pump, and 1 before carb) and the fuel pump. Runs like a top now. Used it 2 weeks ago at the Oshkosh Airshow and was able to run it continusely for 14 hours or more. Have you checked to see what trouble code your start switch is returning?
Flying for work, cruisin' for fun!
2001 Itasca Suncruiser
To everyone who made suggestions: Just a quick update on my problem. The shop today changed out the carburetor on my Onan. (Less than 100 hours on it.)
A word to the wise; After visiting with the mechanic I have realized that I was not running my generator enough and the carburetor had build-up in it. He offered several suggestions including:
1) When I go get my Sunday paper start the generator, let it warm up, then put it on a load. When I finish my paper and coffee, take off the load, then shut it down.
2) Never start or stop the generator while you have a load on it.
3) Maintain the generator on schedule.
He said if I followed this routine, I should have many years of trouble free service.
Thanks to everyone for their input.
Rick & Dee
2006 National Seabreeze
2004 FLHTC as our Toad
Had problems with my Onan. Would run for a short time and begin to surge. Discovered that the electric fuel pump was failing to draw fuel from the tank. Not enough suction. Replaced pump ($330) and filter for good measure. Problems gone. Buy a big bottle of Stabile (fuel stabilizer) and dump it into a full tank. My tank holds 80 gallons so one bottle is right quantity. Drive around a bit to mix it up. Run your genset a couple of times a month to keep batteries up and put a load on it to get it hot. This the best way to prevent fuel problems if your unit sits through the winter or your hunkered down waiting for fuel prices to fall. Lots of luck...
I also use it on my tractor, chainsaws, and weedeaters. Never a clogged carb or messed up fuel injection. Cheap preventation....
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