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Re: [GMCnet] Onan - Vapor Lock? [message #178606 is a reply to message #178602] Tue, 31 July 2012 22:42 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
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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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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