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Old 08-01-2016, 05:18 PM   #11
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We had this problem last year - took the coach to the Onan-Cummins dealer and they played with it for a week and couldn't replicate the problem. I had them do a full oil change (since we were there and all) and it's worked fine ever since. When I was doing my research, there was a lot of speculation about the fuel filter getting clogged as we were driving - but never got anything definitive.
Kinda frustrating, but it works now so okay......

Garren
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Old 08-01-2016, 05:28 PM   #12
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Here's the link to our thread from last year.....maybe will give you some ideas?

Onan Generator Issue - 5500
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Old 08-01-2016, 05:31 PM   #13
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X3 on the oil. Use an OEM spec synthetic oil. It will reduce the operating temperature and save fuel at the same time.


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Old 08-01-2016, 05:34 PM   #14
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Had same problem. My diesel gen supplied by electric fuel pump so--NO vapor lock, that was a myth of the 50's. Took it to a Gen shop. Radiator had so much dust and dirt in the fins it couldn't cool in high heat. Cleaned the fins with engine de greaser, water, and air. Problem solved. May work for you, worth a try and cheap.
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Old 08-02-2016, 08:10 AM   #15
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Sorted fuel pump

I had trouble for a year before I replaced the fuel pump! Was told to replace Cummings fuel pump with airtex pump! No more problems! This is on an Onan 5500 watt gas generator ! Good luck! Travel safely!
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