Community Forums

PHAETON119 · 06-17-2019, 09:36 AM

A few weeks ago I posted about my onan 7500 Quiet Generator starting, running about 20 minutes then quitting. It was then hard to start like a dsl that had run out of fuel. I had already serviced the generator including new Onan fuel filter. My next thought was the fuel pump. Several members agreed and I replaced the fuel pump. No difference. I was busy traveling for work (some of us RVers still do, unfortunately) and just got back onto this issue. I had decided to replace the fuel line. While under the RV tracing down the lines I ran into something. By the way it is on my 2005 Tiffin Phaeton. It was a steel can inline fuel filter. It had undercoating on it. Installed in 2005 and hidden from plain view by a mass of zip tied wiring. I removed the filter and tilted it towards the inlet side and fuel ran out . I then tilted it toward the outlet side. Nothing. I went to my local auto parts store and obtained a matching filter. After installing it and zip tieing everything back into place I hit the primer side of the Onan Rocker Start switch for 3 minutes looking for leaks. there were none. I then started the generator. Purred like a kitten. After running a few minutes I turned on both a/c units. I left it that way for 3 hours. Morrow of the story is before you start looking at circuit boards that cost hundred of dollars, trace the fuel line to the tank. I am glad I did. $4.63 for the filter. A little of my time which seems to have little value. Time to go camping.

MSHappyCampers · 06-17-2019, 11:41 AM

Thanks for the tip! Reminds me of the old KISS principle (keep it simple stupid)

lclwood · 06-19-2019, 09:58 AM

Just recently a 1999 Fleetwood American Eagle and the generator starts and runs fine when I am parked. But when I go to move the coach, the generator will shut down, and when I try to restart it, it acts like it is out of fuel, even though the fuel tank is full. After setting for a while, it will start right back up, and run for hours, until you go to move.

Any ideas?

PHAETON119 · 06-21-2019, 07:47 AM

Good Morning
I am certainly not a expert on Onan Generators. I just got lucky on mine. It seems like if it was a fuel issue it would not matter if you were moving or sitting still. It is my understanding that they have a oil level sensor connected to a shut down switch to shut it down if oil level is low and it is supposed to be pretty sensitive to the full level. If the oil were a little low and you turned a corner causing the oil to slosh to one side or another it could possibly cause a shut down. Realistically it should have a delay to make up for slosh but who knows. Certainally not me. Or the sensor could be faulty although a faulty sensor should cause problems sitting or moving. What was the fault code after shut down? The manual shows where to find the codes as well as what each code means. This will tell you a lot or perhaps nothing. When mine would run out of fuel the code was (engine not running). Anyway, 1st step is to read the code. I know that this is not much help but you have to start somewhere. Good luck.