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gene, RV Mechanic
Category: RV
Satisfied Customers: 1100
Experience:  28 yrs exp in the industry
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Onan 4K generator runs 10 minutes without load and shuts

Customer Question

onan 4K generator runs 10 minutes without load and shuts down. 1st noticed under load of ac but does the same thing without any load at all.
JA: Have you checked the Freon level?
Customer: Why would I? The air conditioning is fine.
JA: What is the model/year of your RV?
Customer: 2007. AC was replaced last year
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: hoping to fix myself. Generator was in last year and they cleaned out the carburetor because it wouldn't start. Its ran monthly even in storage but hoping to head out in 2 weeks for vacation having this issue.
JA: Anything else you think the mechanic should know?
Customer: Replace spark plug, cleaned spark arrestor, and replaced oil & filter.
Submitted: 2 months ago.
Category: RV
Expert:  Randall replied 2 months ago.

This sounds like the fuel pump may be failing. It can run up to 20 minutes and then shut down. I would be sure that the oil level is full as well. I see you changed it, but be sure the level is correct. The low oil switch may be at fault, but those usually go all at once. Those would be the first things to check.

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