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Onan generator 7500

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Richard Davis:
It really seems like you are getting air in your fuel.  I would carefully check the supply and return fuel lines for any issues. The only way I found the issues in my fuel lines on my QD8000 was to disconnect them, pressurize them with air and spray the lines with soapy water.  Boy, did I create bubbles, the supply line was sucking air, but not showing leaks.  Replacing both lines made it run much better. 
Good luck.  Richard
p.s. If you have not replaced the fuel filter, do that also.

Eric Maclean:
Randy
I believe Richard is right  on .
To verify you can do as Richard suggested to check the supply line.
You can also use the fuel can trick to eliminate the fuel supply line altogether to see if that is where your problem is.

Eric

David T. Richelderfer:
Yes, you could have an air leak allowing air to get sucked into the fuel flow.  How long has it been since you filled the diesel tank?  If a long time, then you could have water or algae in the fuel tank, or got filled with a bad load of fuel, in which case your fuel filter could be plugged... even after you recently changed the filter.  Remember, the generator pulls its fuel from the very bottom of the tank.  Have you driven the coach recently at highway speeds up any hills, and if so, did the engine run properly?

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