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Jul 21st, 2025 | | | | Joined: Jan 2002 Posts: 2,254 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,254 | 1948 3100 Chevy
1957 235
Rochester carburetor
My truck run good and drives fine when driven like an old farmer but when I put my food to the floor it sputters and dies.
Any thoughts and/or advice?
TIA
Dennis
-there is nothing stronger than the heart of a volunteer-
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | In what gear and at what speed?
What is the condition of the carburetor?
What techniques have you used to adjust
- the carburetor
- the timing?
| | | | | Joined: Apr 2005 Posts: 7,442 Bolter | | Bolter Joined: Apr 2005 Posts: 7,442 |
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
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“I fought the law and the law won" now I are a retired one!
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| | | | | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | Two possibilities. If you stomp on it & it immediately stumbles & dies it's likely the accelerator pump. If you stomp on it & it runs for a few seconds then stumbles & dies it could be the fuel pump.
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Name your dog Naked so you can walk Naked in the park.
| | | | | Joined: Mar 2011 Posts: 1,149 Shop Shark | | Shop Shark Joined: Mar 2011 Posts: 1,149 | I once had a vehicle where the previous owner sealed the fuel tank sending unit with silicone sealant.
The fuel dissolved the silicone into a gel.
The gel made it into the fuel filter and restricted the fuel flow.
The engine ran good up to about 55 mph then would die, until I let up on the gas pedal, then it would starting running again.
It was like the engine had a governor. | | | | | Joined: Feb 2007 Posts: 230 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 230 | FWIW: I had a situation similar. It was that the fuel bowl in the carb was not completely full due to an incorrect setting of the needle valve. Stomp on it, give it a few seconds to run the fuel out of the bowl, and it sputters. | | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | As stated, it sounds like it is starving for fuel, any restriction in the fuel line could cause that. Float in carb set a bit low, fuel pump startign to go, clogged filter, or, assuming the fuel line routing is similar to my 55 and 58, make sure the flexible fuel line from the tank through the floor of the cab is not getting real old and collapsing or swelling shut. I cleaned the tank and lines on my 55 recently and filled it with some fresh gas. (had been sitting for 3-4 years before I got it). It fired up and ran fine but after sitting with new gas in it for a couple weeks, it swelled shut and would not run. If I let it sit overnight, it wold dribble enough gas through that I could start it and it would run for a bit.... then die. | | | | | Joined: Jan 2002 Posts: 2,254 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,254 | Thanks to all. I bought a rebuild kit for both the carter yf2100s and the Rochester. I'll rebuild both then see if that solves the problem.
Dennis
-there is nothing stronger than the heart of a volunteer-
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