fuel pump problem? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

IOWNATRUCK · 01-13-2012, 02:15 PM

i have an 84 c10 stepside, and sometimes when i press the gas a little too hard the engine bogs out a little then cuts back on and accelerates, could this be a symptom of a bad fuel pump? the problem is extremely random its only happened about twice since ive driven it, so at first i thought it couldve been low gas, or sediment in the tank, has anyone had this problem or have any opinions? im gonna try and drop the tank and clean it out if its not to much of a pain in the a@$, but otherwise, if you do think its the fuel pump, is that an easy install? im not thinking its the carb because everythings new, and it idles like perfectly and gives gas in park perfectly, it only happens in gear, ha like could this be something im making a big deal out of and maybe it was just low on gas or bad gas? any opinions or help are appreciated.
thanks. and to throw this in there, i see that the fuel pump is pushing plenty of fluid through the fuel filter, so now after editing this im thinking its not the fuel pump as much anymore.. haha idk any thoughts? maybe old stale gas at the bottom of the tank since it only had one or two gallons of gas in it total or something?
thanks.

OleBlue79 · 01-13-2012, 03:07 PM

You didn't say what type of carb you have. But, if it's a Quaderajet the problem is probably that the rear flappers are opening too fast and bogging down the motor. That's why it falls flat and then perks back to life when you romp on it. On the top of the carb on the passenger side is an adjustment screw that can be adjusted to speed up or slow down the speed that these flappers open. It is a little set screw you have to loosen and adjust the flappers. It is also kind of hard to see, but it's there. Don't go over a round or so because you will break the spring and have to replace it.

IOWNATRUCK · 01-13-2012, 03:33 PM

its an edelbrock performer 4 barrel carb.

OleBlue79 · 01-13-2012, 04:49 PM

Check the accelerator pump shaft on the front of the carb. It's made of plastic and sometimes they bend and tend to give a problem similar to that if I remeber correctly. It's easy to replace.

01-13-2012, 02:15 PM	#1
IOWNATRUCK Registered User Join Date: Oct 2011 Location: Matthews, NC Posts: 129	fuel pump problem? i have an 84 c10 stepside, and sometimes when i press the gas a little too hard the engine bogs out a little then cuts back on and accelerates, could this be a symptom of a bad fuel pump? the problem is extremely random its only happened about twice since ive driven it, so at first i thought it couldve been low gas, or sediment in the tank, has anyone had this problem or have any opinions? im gonna try and drop the tank and clean it out if its not to much of a pain in the a@$, but otherwise, if you do think its the fuel pump, is that an easy install? im not thinking its the carb because everythings new, and it idles like perfectly and gives gas in park perfectly, it only happens in gear, ha like could this be something im making a big deal out of and maybe it was just low on gas or bad gas? any opinions or help are appreciated. thanks. and to throw this in there, i see that the fuel pump is pushing plenty of fluid through the fuel filter, so now after editing this im thinking its not the fuel pump as much anymore.. haha idk any thoughts? maybe old stale gas at the bottom of the tank since it only had one or two gallons of gas in it total or something? thanks.

01-13-2012, 03:07 PM	#2
OleBlue79 Registered User Join Date: Jan 2010 Location: Louisiana Posts: 127	Re: fuel pump problem? You didn't say what type of carb you have. But, if it's a Quaderajet the problem is probably that the rear flappers are opening too fast and bogging down the motor. That's why it falls flat and then perks back to life when you romp on it. On the top of the carb on the passenger side is an adjustment screw that can be adjusted to speed up or slow down the speed that these flappers open. It is a little set screw you have to loosen and adjust the flappers. It is also kind of hard to see, but it's there. Don't go over a round or so because you will break the spring and have to replace it. __________________ 79 C-20 Scottsdale 350/400 3:73 gears 9 leafs and a headache rack (I speak English, thank you)

01-13-2012, 03:33 PM	#3
IOWNATRUCK Registered User Join Date: Oct 2011 Location: Matthews, NC Posts: 129	Re: fuel pump problem? its an edelbrock performer 4 barrel carb.

01-13-2012, 04:49 PM	#4
OleBlue79 Registered User Join Date: Jan 2010 Location: Louisiana Posts: 127	Re: fuel pump problem? Check the accelerator pump shaft on the front of the carb. It's made of plastic and sometimes they bend and tend to give a problem similar to that if I remeber correctly. It's easy to replace. __________________ 79 C-20 Scottsdale 350/400 3:73 gears 9 leafs and a headache rack (I speak English, thank you)



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