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Mod | | | Forums66 Topics128,032 Posts1,055,523 Members48,425 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jun 2021 Posts: 17 'Bolter | | 'Bolter Joined: Jun 2021 Posts: 17 | I have a GMC first start problem. Here is what I know:
1) if I fill the Carburetor up with fuel from an empty coke bottle with a hole in the lid it will start and respond to the accelerator. Once the fuel runs out (I’m working alone), it stops.
2) the fuel line are clean and the fuel pump appears to be sucking up fuel from the gas tank but not delivering it to the carburetor even though I just replaced both the carb and fuel pump. The new equipment has resulted in the exact same issue.
Any thoughts? | | | | | Joined: Oct 2021 Posts: 6,727 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,727 | These days, new parts cannot be counted on to function properly (especially fuel pumps). Changing two parts at once also muddies the waters when trying to diagnose a problem. Test the fuel pump by following the steps in in the post below to the letter. https://www.stovebolt.com/ubbthread...esting-a-stovebolt-fuel-pump#Post1575679Report back with your findings.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Feb 2004 Posts: 29,759 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,759 | Sun test equipment's motto back in the 1950s still rings true- - - - -"We Test- - - -Not Guess!"
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2000 Posts: 5,198 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,198 | The needle in the carburetor is likely stuck, you can pull the top off or try an air nozzle to dislodge it. | | | | | Joined: Feb 2004 Posts: 29,759 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,759 | Rubber tipped (Viton?) float needles have a nasty habit of getting stuck on the seat and choking off the incoming fuel, particularly if an engine isn't run frequently.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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