Onan 5500 Marquis Carburetor Fixed
I have the gasoline Onan 5500 Marquis BGM series with the altitude adjustment on the bottom of the carburetor fuel bowl. I posted a while back about my genset not running. It wold turn over fine, bu...
Forum Discussion
frankdamp wrote:
Agreed, Jack.
My Onan 5500 is dead also, but with the opposite problem to the one the OP had. I thought I had his problem since I hadn't exercised the generator for about 3 months as I was recovering from cardiac surgery.
I found that the fuel pump was not working, so I replaced it. I couldn't find an Onan part, but got one that looks absolutely identical.
I now have a problem that looks like high fuel pressure. When I prime it, the fuel pump never stops ticking like the original did and the generator coughs and bangs like crazy when I try to start it. It also spits out clouds of white smoke.
Next step is to check fuel pressure and, if it's high, to find out if the pump has an adjustment. It'll be hard to sell the RV if the genny is dead.
If it were me, I'd start out simple and make sure I had reconnected everything securely and there were no air leaks in the fuel line. Sounds more like it's losing pressure rather than being over-pressured. And the white smoke sounds like moisture being burned off.... if it were too rich from too much fuel being forced into the carb, I would think it would be black smoke.
