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Mod | | | Forums66 Topics128,067 Posts1,055,877 Members48,428 | | 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!
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| | | | Joined: Jan 2020 Posts: 620 'Bolter | | 'Bolter Joined: Jan 2020 Posts: 620 | My 54-3100 has been completely rebuilt ( engine ), for 43 years it has had the same starting procedure. Pull choke 3/4 out pump gas peddle twice while pushIng starter foot knob. It always started. After not starting for a week it would start after about 3 seconds. Now after setting for4 days it cranks way too long. It spins very fast ( 12 volt on six volt double batteries), very good Rochester B no leaks, new butterfly shafts and bushings #58 jet, accelerator pump, power piston and spring etc. After letting it set for two hours after turning it over for 15 seconds it started immediately. On my 42, 216 I have always had to dribble gas into carb. to get it to start right away. What I'm I doing wrong ? Doc. Help, help, I'm stuck in Central Florida and it's finally below 98 degrees, I can work outside.
Currently making 1954 3100 better than new and Genetics
| | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | After setting 3-5 days, before you even try to start it, remove the top from the carburetor and see if any gas is in the float bowl. Place to start trouble shooting from.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Feb 2020 Posts: 79 'Bolter | | 'Bolter Joined: Feb 2020 Posts: 79 | How long has the gas been in the tank? Check engine oil level and smell it for gas. Bad fuel pump?
51 GMC 100 with 59 chevy 261 under the hood.
3 on the floor with 3.42 gear.
| | | | | Joined: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | My truck often sits for a while without use and I had the same issues. I solved it with an Airtex E8012S Universal Electric Fuel Pump. This is an inline pump, no separate parallel plumbing required. It allows pretty much unrestricted flow forward while off but prevents backflow. It is also low pressure. I have it hooked up to a push button switch- run it for a few seconds prior to starting the truck if it sat for several days and it starts immediately. I had converted to 12v. If you are 6v you may be able to find something similar. There are other similar 12v pumps too. | | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | Test the fuel pump. It sounds like the one-way valves on either the inlet or the output side (or both) are letting the gas drain back out of the pump-to-carb line when the truck sits idle for a while. Also, you should pull the choke knob out all the way on a cold start, forget about pumping the gas pedal, and crank the engine until it fires. Then push the choke knob in a little to keep the engine from stalling.
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: Jul 2018 Posts: 163 Jolly Roger | | Jolly Roger Joined: Jul 2018 Posts: 163 | tear down the top half of the carb and make sure all the brass tubes arent broken and make sure all the steel bbs are in the proper placement. i had that issue and it had issues starting because it simply ran too rich.
Owner of the most temperamental 1951 3100 in existence
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