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Re: [GMCnet] Onan - Vapor Lock? [message #178455 is a reply to message #178444] Mon, 30 July 2012 20:51 Go to previous messageGo to previous message
Dennis sch is currently offline  Dennis sch   United States
Messages: 58
Registered: July 2012
Location: United States
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I had the same problem with mine. I did the same thing you did. then while I was on a road trip it let me down so I stop at a auto zone and picked up a universal fuel pump 3-7psi $50 i installed it in the parking lot 5 years ago and it solved my problems the gen runs like new every time we go. we just got back from a 10 day road trip and it ran every day at least 8hr a day the best 50 bucks I've spent

Robert Mueller wrote on Mon, 30 July 2012 20:04

G’day,

It seems that whenever the OAT gets to the mid nineties the Onan plays up. When the gas is "cold" it runs just fine. As the day
heats up or if we drive with it on it starts to hunt and then finally shuts down. If I try to restart it immediately no joy but if I
let it sit for about 5 minutes I will start and run for a few minutes then it dies again.

When I was here in February I disassembled the carb and cleaned it thoroughly which must be true as when it's cool it runs PERFECTLY
with a voltage output of 120.

Last week before we left I removed the fuel pump and disassembled it. The "piston" moved up and down in the "bore" nicely, both
plastic check valve balls were in fine shape and moved easily.

I removed the solenoid at the inlet to the pump as I reckoned it was one thing less to fail.

I installed a Pertronics mod a couple of years ago and a new Onan coil.

I really think this is a vapor lock problem - it was 97° in Carlsberg, NM today,

Oh yeah, I did check the fuel level in both tanks and both above 1/2.

As they say in this neck of the woods - any idears?

Regards,
Rob M.
USAussie - Downunder

PS - SURE GLAD I INSTALLED A SECOND ROOF AIR LAST YEAR!

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Dennis S Panama City FL 73 260

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