Carb issues - accelerator pump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hcaz095 · 11-29-2009, 12:12 PM

So, I get some backfiring when I try to gve it more throttle quickly. It also helps if I pump the gas pedal progressively as I'm giving it more gas (like stairs). how would I confirm that it is the accel pump and not a vac leak? How do I cnfirm my carb? It is a California 72 with 350v8... Also, how do icheck if it is a th400 vs th350 turbo- hydromatic?

Zach

Sinister · 11-29-2009, 12:28 PM

Can't help with the carb issue, but you can I.D. the transmission by the shape of the pan. http://www.nastyz28.com/chevy-transm...tification.php

68gmsee · 11-29-2009, 01:18 PM

You can give the accelerator pump a quick visual check with a small flashlight.

Take the breather off the carb, run the truck for a minute or so -running it will insure you have a full bowl and the gas hasn't leaked out -then look in the throat as you manually move the throttle. You should see a good stream of gas squirting out. If it's real weak or if you don't see any, then the pump is supect or the float adjustment.

tim21391 · 11-29-2009, 03:23 PM

maybe you got junk in the float bowl? are u still runnin points?

tim21391 · 11-29-2009, 03:24 PM

my truc kwasnt running right so i wiggled the float and it solved that problem

11-29-2009, 12:12 PM	#1
hcaz095 Registered User Join Date: Mar 2008 Location: Ann Arbor, MI Posts: 61	Carb issues - accelerator pump? So, I get some backfiring when I try to gve it more throttle quickly. It also helps if I pump the gas pedal progressively as I'm giving it more gas (like stairs). how would I confirm that it is the accel pump and not a vac leak? How do I cnfirm my carb? It is a California 72 with 350v8... Also, how do icheck if it is a th400 vs th350 turbo- hydromatic? Zach

11-29-2009, 12:28 PM	#2
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: Carb issues - accelerator pump? Can't help with the carb issue, but you can I.D. the transmission by the shape of the pan. http://www.nastyz28.com/chevy-transm...tification.php __________________ Beat it to fit, Paint it to match...

11-29-2009, 01:18 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Carb issues - accelerator pump? You can give the accelerator pump a quick visual check with a small flashlight. Take the breather off the carb, run the truck for a minute or so -running it will insure you have a full bowl and the gas hasn't leaked out -then look in the throat as you manually move the throttle. You should see a good stream of gas squirting out. If it's real weak or if you don't see any, then the pump is supect or the float adjustment.

11-29-2009, 03:23 PM	#4
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Carb issues - accelerator pump? maybe you got junk in the float bowl? are u still runnin points? __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

11-29-2009, 03:24 PM	#5
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Carb issues - accelerator pump? my truc kwasnt running right so i wiggled the float and it solved that problem __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796



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