| No Fuel-won't start [message #187844] |
Sun, 21 October 2012 08:27  |
pistolnut
Messages: 19
Registered: September 2010
Location: Caldwell, TX
Karma: 0
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Junior Member |
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My GMC had been running fine, I would start it up and run it for 15 minutes or so every weekend. One weekend, it simply wouldn't start, I determined it wasn't getting gas.
The previous owner bypassed the mechanical fuel pump, placing an electric unit on the frame up front in the engine compartment. While I suspect the pumps location to be part of my vapor lock problem, it is not the cause of today's no-start condition. I know that I do have gas in the tanks. When I take the inlet line loose from the fuel pump and pull some vacuum on it I only get air. Is there some place that is typical for fuel lines to come loose, or is there a common problem with the selector that I need to address? I really need to get the GMC moved from where it sits at the moment today if possible.
'76 Birchaven
Caldwell, TX
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| Re: [GMCnet] No Fuel-won't start [message #187846 is a reply to message #187844] |
Sun, 21 October 2012 09:17  |
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Clint
If you actually do have fuel in the tanks, then it the problem has to be a
blockage or open hose between pump inlet and tanks. Did you're gauge on the
vacuum pump register any vacuum?
Depending on how much fuel you have, which tank it's in, and the attitude of
the GMC, maybe it's just all at one end and the pickup tube is dry.
http://gmcmotorhome.info/tank.html
Could always place a gas can in the cockpit and run a temporary hose to fuel
pump inlet for a quick and dirty solution.
hth
bdub
Brownwood, TX
-----Original Message-----
From: On Behalf Of Clint Arnett
Sent: Sunday, October 21, 2012 8:27 AM
Subject: [GMCnet] No Fuel-won't start
My GMC had been running fine, I would start it up and run it for 15 minutes
or so every weekend. One weekend, it simply wouldn't start, I determined it
wasn't getting gas.
The previous owner bypassed the mechanical fuel pump, placing an electric
unit on the frame up front in the engine compartment. While I suspect the
pumps location to be part of my vapor lock problem, it is not the cause of
today's no-start condition. I know that I do have gas in the tanks. When I
take the inlet line loose from the fuel pump and pull some vacuum on it I
only get air. Is there some place that is typical for fuel lines to come
loose, or is there a common problem with the selector that I need to
address? I really need to get the GMC moved from where it sits at the moment
today if possible.
--
'76 Birchaven
Caldwell, TX
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bdub
bdub.net
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| Re: No Fuel-won't start [message #187847 is a reply to message #187844] |
Sun, 21 October 2012 09:22 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| pistolnut wrote on Sun, 21 October 2012 09:27 |
My GMC had been running fine, I would start it up and run it for 15 minutes or so every weekend. One weekend, it simply wouldn't start, I determined it wasn't getting gas.
The previous owner bypassed the mechanical fuel pump, placing an electric unit on the frame up front in the engine compartment. While I suspect the pumps location to be part of my vapor lock problem, it is not the cause of today's no-start condition. I know that I do have gas in the tanks. When I take the inlet line loose from the fuel pump and pull some vacuum on it I only get air. Is there some place that is typical for fuel lines to come loose, or is there a common problem with the selector that I need to address? I really need to get the GMC moved from where it sits at the moment today if possible.
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Clint,
I kind of hate to tell you this, but I am pretty sure that I know where your problem is...
There are rubber lines that go to tank pick ups. They are both on top of the fuel tanks. They probably have not been replaced and are now close to 40 years old. They would be bad even without any ethanol.
It is probably not the selector valve, but they go bad too.
Get ready to jack the coach WAY up and let the tanks down. This is not a very hard job, but it is a major PITA. Replace the lines over the tank either with barrier hose SAE J30R14 barrier hose or metal. Do not attempt metal unless A: you have amazing patience or B: you worked as an instrument fitter at one time.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] No Fuel-won't start [message #187849 is a reply to message #187844] |
Sun, 21 October 2012 09:36 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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- did you try both tanks - main / aux ?
- if neither works, could be the selector valve
- or the hose from the selector to the pump
- since you have removed the hose to the pump input
- try dipping the hose into a gas can and see if it will run
- if not, maybe the pump
good luck
gene
On Sun, Oct 21, 2012 at 6:27 AM, Clint Arnett <pistolnut@gmail.com> wrote:
>
>
> My GMC had been running fine, I would start it up and run it for 15
> minutes or so every weekend. One weekend, it simply wouldn't start, I
> determined it wasn't getting gas.
>
> The previous owner bypassed the mechanical fuel pump, placing an electric
> unit on the frame up front in the engine compartment. While I suspect the
> pumps location to be part of my vapor lock problem, it is not the cause of
> today's no-start condition. I know that I do have gas in the tanks. When I
> take the inlet line loose from the fuel pump and pull some vacuum on it I
> only get air. Is there some place that is typical for fuel lines to come
> loose, or is there a common problem with the selector that I need to
> address? I really need to get the GMC moved from where it sits at the
> moment today if possible.
> --
> '76 Birchaven
> Caldwell, TX
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: No Fuel-won't start [message #187851 is a reply to message #187847] |
Sun, 21 October 2012 10:13 |
pistolnut
Messages: 19
Registered: September 2010
Location: Caldwell, TX
Karma: 0
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Junior Member |
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[quote title=Matt Colie wrote on Sun, 21 October 2012 09:22
Get ready to jack the coach WAY up and let the tanks down. This is not a very hard job, but it is a major PITA. Replace the lines over the tank either with barrier hose SAE J30R14 barrier hose or metal. Do not attempt metal unless A: you have amazing patience or B: you worked as an instrument fitter at one time.
Matt [/quote]
Getting under it enough to see what is going on is one of my big problems. The Twinkie's parking spot is on a gravel driveway.
Most all of the rubber lines, hoses, etc. have been replaced. I'm betting you are right though, that a hose has gone bad or come loose somewhere that I can't reach it. I've tried both main and aux and don't get anything either way, makes me think its a bad hose instead of the selector. I'll try taking the lines loose at the selector (now that I know where it is) and see if I get fuel from one tank and not the other.
'76 Birchaven
Caldwell, TX
[Updated on: Sun, 21 October 2012 10:13] Report message to a moderator |
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| Re: [GMCnet] No Fuel-won't start [message #187896 is a reply to message #187885] |
Sun, 21 October 2012 18:29 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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If you need to move it now, do what Billy suggested.
We do that our shop frequently to move a coach from across town,
On Sun, Oct 21, 2012 at 2:56 PM, Michael <radioactive626@msn.com> wrote:
>
>
> Your not patient!? 8o
> --
> ***"Gettin There"-1973 23' Sequoia-
> Michael, Casa Grande, AZ
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Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] No Fuel-won't start [message #187910 is a reply to message #187846] |
Sun, 21 October 2012 22:00 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| Billy Massey wrote on Sun, 21 October 2012 07:17 |
...
Could always place a gas can in the cockpit and run a temporary hose to fuel pump inlet for a quick and dirty solution. ...
|
I've Done That!
<http://www.gmcmhphotos.com/photos/mike-s-gmc-stable/p38033-boattank1.html>
I drove a coach home from eastern Oregon with a 6 gallon tank.
I would REALLY recommend a boat outboard motor tank rather than an open gas can. (But the open can would work..... )
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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