So we bought a new to us 2004 Holiday Rambler Endeavor. It has a 7500 Onan with 570 hrs. Picked it up yesterday. Gen started right up and ran perfectly. That was at 4PM. It ran non stop without problem till about 5AM. It just died, cranked on it 7-8 times. It would just spit and sputter, then started right up. Ran non stop till about noon today..Died, same thing spit sputter try to crank then fired up and ran for 15-20 mins died again, same thing, run for a few mins then die.. Finale started back up and ran no problems for 3 more hours. Pulled in the driveway..died..spit sputter..start back up. When you are trying to start it, it acts like its not getting fuel, lost prime or something. Any ideas??

Probably need to change the fuel filter.

If it's not the fuel filter, We had a hole in our fuel line going to our Onan generator. The generator gives a fault code. The Cummins service center we took ours to diagnosed it in about 5 mins. They had to replace fuel lines. Quick service, reasonable price. There is a Cummins service center in Fort Worth. They might be able to help you diagnose it over the phone.

SCVJeff wrote:How much fuel is in the tank?You need at least a fourth of a tank of gas as the generator is designed to only draw fuel until your tank is one fourth full. That way you won't run out of fuel if boon docking.

Fuel tank is full.. There is no pattern to when it does it. Might be 12 hours might be 12 minutes. When you try to restart it acts just like it has lost prime.

Onan diesel gen problem | Good Sam Community

Jamboree89
Explorer
Feb 15, 2015
Probably need to change the fuel filter.
SCVJeff
Explorer
Feb 15, 2015
How much fuel is in the tank?
sdianel_-acct_c
Explorer
Feb 15, 2015
If it's not the fuel filter,
We had a hole in our fuel line going to our Onan generator. The generator gives a fault code. The Cummins service center we took ours to diagnosed it in about 5 mins. They had to replace fuel lines. Quick service, reasonable price. There is a Cummins service center in Fort Worth. They might be able to help you diagnose it over the phone.
Valkyriebush
Explorer II
Feb 15, 2015
SCVJeff wrote:
How much fuel is in the tank?

You need at least a fourth of a tank of gas as the generator is designed to only draw fuel until your tank is one fourth full. That way you won't run out of fuel if boon docking.
jtad
Explorer
Feb 15, 2015
Fuel tank is full.. There is no pattern to when it does it. Might be 12 hours might be 12 minutes. When you try to restart it acts just like it has lost prime.
KD4UPL
Explorer
Feb 15, 2015
I would say you have an air leak somewhere. It could be a loose fitting or hose, a cracked hose, a loose filter, loose bleed screw, etc. It might be hard to find. I'd follow the fuel line from the tank and look for signs of leaking fuel.
I'd replace the fuel filter too, their cheap and it's good maintenance since you probably don't know when it was changed last.
azrving
Explorer
Feb 15, 2015
At that age it could be very likely that it has a bad fuel line and is sucking air. It could be very erratic with no pattern, that's what suction side issues act like. I would do the fuel lines and filter and see what happens. Even if that's not it, you are not wasting any money as rubber components are a maintenance issue anyway.
Big_Katuna
Explorer II
Feb 15, 2015
Change the fuel filter and retry.
jtad
Explorer
Feb 15, 2015
I am at work today, but there is a cummins/onan dealer right around the corner. Where would you find the model number of that gen set so I can explain to the wife how to go get the number for me. I will stop and get a couple of filters in the AM.
SCVJeff
Explorer
Feb 15, 2015
Even Camping World has those filters on the shelf