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| Re: [GMCnet] Shut off valve on Onan [message #133353 is a reply to message #133330] |
Tue, 05 July 2011 00:40   |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| powerjon wrote on Mon, 04 July 2011 17:11 |
On Jul 4, 2011, at 7:51 PM, Stacey and Bonnie Antoniuk wrote:
> Hello GMC'ers Our Onan is finally running great....without the
> shut off
> valve just before the fuel pump. Can anyone tell me what it does?
> and is
> it necessary?
Read here: http://gmcmotorhomeinfo.com/generator.html#solenoid
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Most people would say you do not NEED it.
It is part of the emissions control system.
The only time you would notice it missing is when your fuel tanks had to much pressure in them and over powered the float valve in the Onan carburetor.
IE: If your vent lines from your fuel tanks are clear, and the fuel separator in the driver's side rear wheel well is good and the carbon canisters in the wheel well under the passenger seat are not clogged... and you do not over fill the tank and then park on a hill (with the Onan carb lower than your tanks).... you shouldn't have a problem.
Many have removed the valve (including me on my 6k) and not had any issues.
Bottom line: I would not remove it unless it was bad, but I wouldn't worry about it if it was gone.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Shut off valve on Onan [message #133365 is a reply to message #133360] |
Tue, 05 July 2011 07:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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One possible use for the shut off valve on non-GM upfitted coaches is to keep the main GMC engine from sucking the Onan fuel line dry and then sucking air through the needle and seat valve of the Onan carb. This would not be a problem on a GM upfitted coach because GM used a separate fuel line from the tank ratht than teeing in to the same fuel pickup line from the tank.
I have never hear of anyone having having this problem. My 1976 GM upfitted coach does not have this valve.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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