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Joined: Jan 2002
Posts: 2,405
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?


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Joined: Sep 2001
Posts: 31,811
Bubba - Curmudgeon
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?

Tim []
1954 3106 Carryall Suburban [] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. []
Joined: Apr 2005
Posts: 11,611
“Grease Monkey” “Former herder of cats”
Fuel starvation?

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'47 Chevy 3100 5 Window (long term project)
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Joined: Aug 2005
Posts: 9,527
Ex Hall Monitor
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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Joined: Mar 2011
Posts: 1,509
Shop Shark
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
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: 2,436
Big Bolt Forum Moderator
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.


1955 Chevy 6400 ex-flatbed (no bed now!)
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1958 Chevy 6400 flatbed W/dump
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1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
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Joined: Jan 2002
Posts: 2,405
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.

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Moderated by  Phak1, Woogeroo 

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