| generator fuel [message #100823] |
Thu, 23 September 2010 20:22  |
Smitty52
Messages: 181
Registered: July 2007
Karma: 0
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Senior Member |
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I have not been able to get the Onan to run for any length of time. I checked the fuel pump and it has power and tonight was buzzing away. If I put a hose in a gas container it will suck fuel. However, with full coach tanks it will not draw fuel from the coach tanks. I am going to replace the hose inside the drawer due to age. I am thinking the pickup is bad in the tank or it is sucking air somewhere along the line. A week ago I did have it running for an hour but it would not start the next day.
Any thoughts on where to look?
Wayne and Lisa,
Bolton Landing, NY,
Patriot Guard Rider,
Standing for those who stood for us.
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| Re: [GMCnet] generator fuel [message #100825 is a reply to message #100824] |
Thu, 23 September 2010 21:17  |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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| emerystora wrote on Thu, 23 September 2010 19:02 |
On Sep 23, 2010, at 8:22 PM, Wayne E LaMothe wrote:
>
>
> I have not been able to get the Onan to run for any length of time. I checked the fuel pump and it has power and tonight was buzzing away. If I put a hose in a gas container it will suck fuel. However, with full coach tanks it will not draw fuel from the coach tanks. I am going to replace the hose inside the drawer due to age. I am thinking the pickup is bad in the tank or it is sucking air somewhere along the line. A week ago I did have it running for an hour but it would not start the next day.
>
> Any thoughts on where to look?
> --
> Wayne and Lisa,
> Bolton Landing, NY,
>
Since you have a Royale it does not use a pickup tube in the tank. Coachmen just connected the Onan by using a tee in the line going from the rear tank to the fuel selector valve so you don't have to drop the tanks to get to it.
It sounds as if you likely have a small hole in your line which is sucking air along with the fuel.
Look for a tee in the fuel line which would be alongside the driver's side of the rear fuel tank. You should be able to reach this connection by reaching up alongside the frame. Replace the hose going from this tee to the Onan.
Emery Stora
77 Kingsley
Santa Fe, NM
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Emery: Am I remembering incorrectly, or was there some check valve in the original lines that was essentially useless but did cause issues? I am wondering if Wayne pulled the line off to check it with the gas can he might have done that without the check valve in the line so it worked that way but not when connected to the tank. My memory is fading though, and I may be really out to lunch on this possibility. Someone must remember about this.
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] generator fuel [message #100827 is a reply to message #100825] |
Thu, 23 September 2010 21:28 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| idrob wrote on Thu, 23 September 2010 19:17 |
... Am I remembering incorrectly, or was there some check valve in the original lines that was essentially useless but did cause issues? ...
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I think you are talking about the solenoid valve normally mounted to the input side of the pump. It is powered by the same power that supplies the pump.
I found out the purpose in an early Onan manual. (pre TZE) You are correct that it isn't there for Onan operation. It was installed to keep the pressure in the tanks from overpowering the float in the Onan carb, venting the tanks through the Onan... ie pushing too much raw gas.
If your vent lines work as advertized, it isn't needed.
But I suspect his problem is the fuel lines. (but could be wrong.)
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] generator fuel [message #100836 is a reply to message #100828] |
Thu, 23 September 2010 22:30 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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| jw mills wrote on Thu, 23 September 2010 21:24 |
My GUESS would be pinholes in the hose to the tank. Doubt if the pickup
is bad
but I don't think that Coachmen used the pickup I think they just T'ed
into the engine pickup line from the rear tank.
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My Royale was teed into the front tank. no check valve.
But it had been touched sometime in the past.
I'd say drop the tank and hook it up right. The fitting is right there!
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] generator fuel [message #100847 is a reply to message #100836] |
Fri, 24 September 2010 07:03 |
Smitty52
Messages: 181
Registered: July 2007
Karma: 0
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Senior Member |
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Thanks for the input. I did remove the shutoff valve just before the Onan fuel pump to see if that was causing the problem. I believe that is the low oil shut off. I know there is power to the pump when cranking the Onan so it has to be a fuel line somewhere.
We were still trying to make DuQuoin but Lisa is not recovering from her surgery like we hoped so we are going to go out to the Maine coast later next week. I would like to get it running by then.
Wayne and Lisa,
Bolton Landing, NY,
Patriot Guard Rider,
Standing for those who stood for us.
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