Onan generator shuts down
I have an Onan Marquis 5500 Generator on my 33R, 2002 Fleetwood Bounder that runs for approximately twenty minutes and then randomly revs up and down, then shuts off. It seems to last a little long...
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Several years back I had the same problem with the Onan Microquiet 4KY generator in our MH. The generator would run for 15-20 minutes, then surge like a lawn mower does when it runs out of gas and shut down. After this happened, the generator would crank OK but wouldn't restart. I discovered that if I waited for 1/2 hour or so, the generator would start and run for another 15-20 minutes before surging and quitting.
Our generator has a "prime" function on the start rocker switch at the generator. This function runs the fuel pump without cranking the starter, which allowed me to hear whether the fuel pump was running. I found that if I tried the prime right after the generator shut down by itself, there was no buzzing sound from the fuel pump. A 1/2 hour later, using prime would give me the normal sound from the pump. I figured that the pump must be heating up and seizing after running for a short while.
Replaced the fuel pump and no more problems since. Replaced the fuel filter while I was at it.
Our generator has a "prime" function on the start rocker switch at the generator. This function runs the fuel pump without cranking the starter, which allowed me to hear whether the fuel pump was running. I found that if I tried the prime right after the generator shut down by itself, there was no buzzing sound from the fuel pump. A 1/2 hour later, using prime would give me the normal sound from the pump. I figured that the pump must be heating up and seizing after running for a short while.
Replaced the fuel pump and no more problems since. Replaced the fuel filter while I was at it.
