| Onan Fuel Pump Mystery [message #176473] |
Thu, 12 July 2012 13:34  |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
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Onan Experts,
My Onan has run fine for years. Now it will start and run for 30-45 seconds and then die; as if running out of gas.
I jumpered between #5 and #9 terminals on the board. Pump runs fast at first and then slows as it pressurs up.
I ran a hose from a gas can to the pump. Same symptom. I removed the bottom of the pump; filter screen is clean- small amt of stuff in bottom of filter cap.
Reinstalled filter and removed discharge hose from pump. Jumpered 5&9 pump runs and discharges what seems like sufficient fuel. Not a steady stream- it sputters but puts out a lot of fuel.
Reattached hose- Starts up and then dies.
If I try to start again immediatly takes a while of cranking before starting.
If I let the pump run a bit before starting; it will start right away then die as it runs out of gas.
I bought a replacement pump but before installing thought I'd see if there is a simple solution that I'm missing.
Any suggestions? Thanks
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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