Forum Discussion

hotjag1's avatar
hotjag1
Explorer II
Jan 30, 2022

Onan diesel generator quits after a few minuthes

I browse this forum fairly often, but now I need some advice or expertise on what is wrong with my generator. It is a 6500 watt Onan. It starts up fairly quickly and generates power within a couple...
Matt_Colie's avatar
Matt_Colie
Explorer II
Jan 30, 2022
It sure sounds like a fuel system issue to me. Most like there is a very serious restriction in the low pressure side of the system. That could be anyplace between the tank's fill neck and the inlet to the fuel lift pump.

The poor thing keeps trying to pump and draws a vacuum on the system up until it can't. Then, once shut down, fuel fills in the vacuum. I can't begin to tell you where to look except before the lift pump.

Matt - 60yr a diesel engineer

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,211 PostsLatest Activity: Mar 08, 2025