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

**68350** · 08-16-2006, 12:46 PM

I have a 72 with the original 350, quadrajet 4 barrel. It will start if you dump gas down the carb, but doesn't stay running. I took the fuel line off and the fuel pump worked, so I changed fuel filters, but still no luck. I was thinking the fuel pump doesn't have enough push left after being connected to the fuel filter, but not sure. Any ideas? thanks

cdowns · 08-16-2006, 12:50 PM

could be the filter in the tank is filled plugged up with 35years of crap and when you changed the filter in the carb did you put it in backwards

**68350** · 08-16-2006, 12:54 PM

i can check that, but the weird thing is that i drove it 300 miles up to my place and didn't have a drop of trouble. Then I added power steering and it started acting up. i will check the tank filter, though. thanks

sneakysnake · 08-16-2006, 01:28 PM

If you pulled the line at the carb, and was getting gas to there. Then you may have have a stuck(shut) float in the carb.

shelby987 · 08-16-2006, 02:42 PM

I had a very similar problem with my truck, I swapped carbs from a 1bbl to a 4bbl. Before the conversion, the truck ran perfectly, I was getting gas to the carb, the filters were all new and in the correct orientation, fuel in the carb would get it running, and if I kept my foot on the gas it would stay running (albeit badly). I pulled the fuel pump and replaced it, problem solved, if everything else seems to be in order, its a good, inexpensive place to start, worst case its one less thing you will have to replace on the side of the road!

08-16-2006, 12:46 PM	#1
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	fuel pump bad??? I have a 72 with the original 350, quadrajet 4 barrel. It will start if you dump gas down the carb, but doesn't stay running. I took the fuel line off and the fuel pump worked, so I changed fuel filters, but still no luck. I was thinking the fuel pump doesn't have enough push left after being connected to the fuel filter, but not sure. Any ideas? thanks __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

08-16-2006, 12:50 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: fuel pump bad??? could be the filter in the tank is filled plugged up with 35years of crap and when you changed the filter in the carb did you put it in backwards __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 08-16-2006 at 12:53 PM.

08-16-2006, 12:54 PM	#3
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: fuel pump bad??? i can check that, but the weird thing is that i drove it 300 miles up to my place and didn't have a drop of trouble. Then I added power steering and it started acting up. i will check the tank filter, though. thanks __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

08-16-2006, 01:28 PM	#4
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: fuel pump bad??? If you pulled the line at the carb, and was getting gas to there. Then you may have have a stuck(shut) float in the carb.

08-16-2006, 02:42 PM	#5
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: fuel pump bad??? I had a very similar problem with my truck, I swapped carbs from a 1bbl to a 4bbl. Before the conversion, the truck ran perfectly, I was getting gas to the carb, the filters were all new and in the correct orientation, fuel in the carb would get it running, and if I kept my foot on the gas it would stay running (albeit badly). I pulled the fuel pump and replaced it, problem solved, if everything else seems to be in order, its a good, inexpensive place to start, worst case its one less thing you will have to replace on the side of the road! __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

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