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Re: [GMCnet] Onan - Vapor Lock? [message #178608 is a reply to message #178606] Tue, 31 July 2012 22:55 Go to previous messageGo to previous message
k2gkk is currently offline  k2gkk   United States
Messages: 4452
Registered: November 2009
Karma:
Senior Member

The only way I can see that the fuel pump could
"overcome" the float and needle valve would be
if crud in the fuel kept the needle from seating
correctly. High pressure SHOULD simply push the
needle onto the seat with more force.

I believe that the small Mr Gasket pump by Facet
is the one that somebody directed me to. If I
recall, the pressure available is 1.5 to 4.0 psi
and that is not really all that much.


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~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
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> From: robmueller@iinet.net.au
> To: gmclist@temp.gmcnet.org
> Date: Tue, 31 Jul 2012 21:42:04 -0600
> Subject: Re: [GMCnet] Onan - Vapor Lock?
>
> Steve,
>
> See my last message under Onan replacement pump. It is supposed to have an anti-siphon function (positive shut off).
>
> Having said that I do agree that at some point if there was enough pressure in the fuel tanks on a hot day it could drive fuel
> through the pump and into the carb inlet and overcome the float valve.
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Steve Southworth
> Sent: Tuesday, July 31, 2012 9:19 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Onan - Vapor Lock?
>
>
>
> Robert Mueller wrote on Tue, 31 July 2012 19:30
> > Steve,
> >
> > The solenoid has two wires going to it (+/-) they come over from the control board. It appeared to me that it is either on/open or
> > off/closed. I don't know of any device on the Onan that would cause it to regulate pressure or flow from the tank to the pump /
> > carb.
> >
> > I vaguely remember reading that the solenoid was added because of some Canadian rule.
> >
> > Rob M.
>
>
> Correct - the solenoid valve has no pressure regulating function other than: Onan off = zero fuel flow. The example was that the
> GMC was parked with the Onan off. Fuel was spilling from the carb.
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI

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