| Help won't stay running [message #204074] |
Mon, 08 April 2013 16:31  |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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I have been chasing the gremlin of sputtering at around 35mph. After I got past 35 it was fine. Here is the background of everything. I dropped both tanks (cleaned and coated. New senders, metal lines, new selector, new electric pump, new filter before pump, and rebuilt carb from Jim K. It was a ton better but still stumbled at 35. I could not find any leaks anywhere but I could drive it. I took the family from Houston to Sea World and back no major issues but still stumbled at 35 five or six times. Today I removed the manual pump, installed the block off plate. Now with that done it starts runs for a minute or two then just dies. If I start it and rev up the engine it sounds great and runs but then just cuts off. Any suggestions as I hate to put the manual pump back on as would like to finally fix the issue?? Trying to make it to Dallas this weekend with the family.
Charley Harris
Magnolia Texas
1976 Edgemont
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| Re: [GMCnet] Help won't stay running [message #204076 is a reply to message #204074] |
Mon, 08 April 2013 16:42  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Next time it stalls, crack the fuel line fitting to the carb and see if you
have fuel. If you do, you could have a sticking inlet needle, or low fuel
pump pressure. Do NOT FALL INTO THE "It can't be the fuel pump because it
is brand new" trap. New stuff fails more often than experienced parts do.
Also, make sure you have the correct gas cap on the coach. Gmc used a semi
vented cap.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Apr 8, 2013 2:31 PM, "Charley Harris" <charley.harris@bakerhughes.com>
wrote:
>
>
> I have been chasing the gremlin of sputtering at around 35mph. After I
> got past 35 it was fine. Here is the background of everything. I dropped
> both tanks (cleaned and coated. New senders, metal lines, new selector,
> new electric pump, new filter before pump, and rebuilt carb from Jim K.
> It was a ton better but still stumbled at 35. I could not find any leaks
> anywhere but I could drive it. I took the family from Houston to Sea World
> and back no major issues but still stumbled at 35 five or six times. Today
> I removed the manual pump, installed the block off plate. Now with that
> done it starts runs for a minute or two then just dies. If I start it and
> rev up the engine it sounds great and runs but then just cuts off. Any
> suggestions as I hate to put the manual pump back on as would like to
> finally fix the issue?? Trying to make it to Dallas this weekend with the
> family.
> --
> Charley Harris
> Magnolia Texas
> 1976 Edgemont
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: Help won't stay running [message #204113 is a reply to message #204074] |
Mon, 08 April 2013 20:49 |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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Senior Member |
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Okay looks like I will go ahead and order another fuel pump. I just picked up a fuel pressure guage and hope to get that on tomorrow to see where I am at with that. Thanks for the suggestions.
Charley Harris
Magnolia Texas
1976 Edgemont
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| Re: Help won't stay running [message #204128 is a reply to message #204074] |
Tue, 09 April 2013 01:23 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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| Charley wrote on Mon, 08 April 2013 14:31 |
I have been chasing the gremlin of sputtering at around 35mph. After I got past 35 it was fine. Here is the background of everything. I dropped both tanks (cleaned and coated. New senders, metal lines, new selector, new electric pump, new filter before pump, and rebuilt carb from Jim K. It was a ton better but still stumbled at 35. I could not find any leaks anywhere but I could drive it. I took the family from Houston to Sea World and back no major issues but still stumbled at 35 five or six times. Today I removed the manual pump, installed the block off plate. Now with that done it starts runs for a minute or two then just dies. If I start it and rev up the engine it sounds great and runs but then just cuts off. Any suggestions as I hate to put the manual pump back on as would like to finally fix the issue?? Trying to make it to Dallas this weekend with the family.
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Pull the distributor cap if it is a HEI. Look carefully at the weights to make sure the rotor is not jumping a spark to the weights. A tiny crack will leak down but higher RPMs pulls the weights out if arcing distance. The real symptom for this is it dying when you give it gas at lower RPMs. Increased compression will make it harder for the spark to jump and it will take the easier route to the weights. Get some RPMs and it will go like a scared rabbit.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Help won't stay running [message #204133 is a reply to message #204113] |
Tue, 09 April 2013 06:14 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Be careful with that fuel pressure gauge. I've had a several fail,
including one that leaked and dumped raw fuel on the exhaust manifold. I
would not leave one in place for very long with the engine concealed.
JMHO,
Ken H.
On Mon, Apr 8, 2013 at 9:49 PM, Charley Harris wrote:
>
>
> Okay looks like I will go ahead and order another fuel pump. I just
> picked up a fuel pressure guage and hope to get that on tomorrow to see
> where I am at with that. Thanks for the suggestions.
> --
>
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Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Help won't stay running [message #204173 is a reply to message #204074] |
Tue, 09 April 2013 17:54 |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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Senior Member |
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Well put the fuel pressure guage and it is around 5 psi with the ignition in the on position but once I crank the the wire to the pump goes to zero volts. I must have something wired wrong through the oil pressure switch. 3 terminals one for the 12 volt ignition source, one to the starter solenoid, and one to the pump. So confused on why it stops once I start it? So will have to see if it is the way it is wired or bad switch? Driving me nuts! Am I doing something wrong?
Charley Harris
Magnolia Texas
1976 Edgemont
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| Re: Help won't stay running [message #204175 is a reply to message #204074] |
Tue, 09 April 2013 17:56 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Sounds like you have it on the start lug of the ignition switch instead of the run lug. You can run a jumper directly to the battery or to a full time hot point and see if that solves your problem. Bet it does.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: Help won't stay running [message #204183 is a reply to message #204074] |
Tue, 09 April 2013 18:40 |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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Senior Member |
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Okay fixed the issue I had it wired wrong through the oil pressure switch. Add this to the list of dumb things I have done! Well will be taking a test drive to see if it still stumbles. Wish me luck.
Charley Harris
Magnolia Texas
1976 Edgemont
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| Re: Help won't stay running [message #204228 is a reply to message #204074] |
Tue, 09 April 2013 22:51 |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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Senior Member |
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Yes, the support this group gives can not even begin to be measured. It is a good feeling once you you fix an issue. Thanks to all for all the suggestions. Dan thanks for the reminder as I move to find the leak in my air system. The new Sully system is installed but still leaks down over a few days. Oh well keeps me out of trouble.
Charley Harris
Magnolia Texas
1976 Edgemont
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| Re: Help won't stay running [message #204294 is a reply to message #204074] |
Wed, 10 April 2013 15:32 |
Charley
Messages: 116
Registered: September 2010
Location: Magnolia Texas
Karma: 0
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Senior Member |
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Raining here today but I did spray all the connections with soapy water on the outside and all seems to be okay there. I think it is leaking inside the coach near the pump as my system does not have a tank and is located in the back driver side under the bed. Will check it later as right now it is a slow leak and hope to be heading towards Dallas this weekend. I really do like the Sully set up.
Charley Harris
Magnolia Texas
1976 Edgemont
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