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Re: [GMCnet] Onan - Vapor Lock? [message #178624 is a reply to message #178444] Wed, 01 August 2012 06:33 Go to previous message
Steven Ferguson is currently offline  Steven Ferguson   United States
Messages: 3447
Registered: May 2006
Karma:
Senior Member
This is a reach Rob, but I was having exactly the same problem when we
attended the GMCWS Rally at Hart Ranch in SD. Duane Simmons worked on it
for 3 hours and finally tossed in the towel. (I had the only Onal that
kicked Mr. Onan's butt). When we got back home, I checked the timing
(Pertronix unit installed) and when it warmed up, the timing would shift
just enough to keep it from running. Moved the timing one red on and it
never quit again.

On Mon, Jul 30, 2012 at 6:04 PM, Rob Mueller <robmueller@iinet.net.au>wrote:

> 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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--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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