Carb or fuel tank? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

birdie · 11-01-2009, 01:44 AM

I just got a 72 1 ton with a flat deck on it. The PO took the tank out of the cab and put it on the deck. When the truck is cold it starts and runs fine but after about 5 mins it stalls and most times wont start again for a couple of hours. I put a new fuel pump on but that hasn't helped. I put a clear fuel filter on it and you can see the fuel being pumped and then it just slowy starves itself. It has a 4bbl Quadrejet on it and when it runs it runs real nice. I am just stumped on what might be the problem.

Jacfourteen · 11-01-2009, 01:58 AM

sounds like a clogged line to me. you might also check to see if there is another filter mounted somewhere that is plugged up, you never know where a po might have put one.

Tucknuts · 11-01-2009, 02:07 AM

it sounds like the tank doesn't have an air vent to allow air into the tank. this would cause it to create a suction but then stop it because no air getting into the tank. I could be wrong but try removing the cap to see if that helps.

drivea55 · 11-01-2009, 02:09 AM

Your explanation of the clear filter says on face value of fuel starvation (after 5 min does the filter go dry?), I am wondering if a line got kinked when the tank got relocated or what route it takes that may cause a slow flow.
if you pull the hose from the pump and put it in a can full of fuel does it still stall after 5 min.?
eliminate 1 thing at a time, keep it simple... back track to a can of fuel and expand from there.

my 2 cents...

good luck!
BriaN

67ChevyRedneck · 11-01-2009, 02:16 AM

Quote:

Originally Posted by Tucknuts

it sounds like the tank doesn't have an air vent to allow air into the tank. this would cause it to create a suction but then stop it because no air getting into the tank. I could be wrong but try removing the cap to see if that helps.

Tank not venting. Remove the cap and run the truck. See what happens.

Longhorn Man · 11-01-2009, 10:57 AM

you'd be amazed at how often the fuel filters are almost empty when the engine is running. I say don't call it fuel starvation, untill you crack open the carb and SEE the lack of ffuel.
Tank location wouldn't have anything to do with it.

birdie · 11-01-2009, 04:11 PM

Thanks for the replys, when the wife gets home I will go out and give some of your ideas a try.

birdie · 11-01-2009, 07:40 PM

Well I am pretty sure it is the carb. The next question is do I put in a carb kit or just get a rebuilt carb? It is a Quadrajet by the way

11-01-2009, 01:44 AM	#1
birdie Registered User Join Date: Nov 2005 Location: Rouleau, Saskatchewan Posts: 87	Carb or fuel tank? I just got a 72 1 ton with a flat deck on it. The PO took the tank out of the cab and put it on the deck. When the truck is cold it starts and runs fine but after about 5 mins it stalls and most times wont start again for a couple of hours. I put a new fuel pump on but that hasn't helped. I put a clear fuel filter on it and you can see the fuel being pumped and then it just slowy starves itself. It has a 4bbl Quadrejet on it and when it runs it runs real nice. I am just stumped on what might be the problem. __________________ 1946 Chevy ton truck 1972 Chev C30 1975 Scottsdale C10 Last edited by birdie; 11-01-2009 at 01:46 AM.

11-01-2009, 01:58 AM	#2
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Carb or fuel tank? sounds like a clogged line to me. you might also check to see if there is another filter mounted somewhere that is plugged up, you never know where a po might have put one. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

11-01-2009, 02:07 AM	#3
Tucknuts can I tuck tractor wheels? Join Date: May 2009 Location: Colorado Springs , Colorado Posts: 135	Re: Carb or fuel tank? it sounds like the tank doesn't have an air vent to allow air into the tank. this would cause it to create a suction but then stop it because no air getting into the tank. I could be wrong but try removing the cap to see if that helps. __________________ My build page.... http://67-72chevytrucks.com/vboard/s...d.php?t=347666

11-01-2009, 02:09 AM	#4
drivea55 Registered User Join Date: Oct 2009 Location: Monson,MA Posts: 503	Re: Carb or fuel tank? Your explanation of the clear filter says on face value of fuel starvation (after 5 min does the filter go dry?), I am wondering if a line got kinked when the tank got relocated or what route it takes that may cause a slow flow. if you pull the hose from the pump and put it in a can full of fuel does it still stall after 5 min.? eliminate 1 thing at a time, keep it simple... back track to a can of fuel and expand from there. my 2 cents... good luck! BriaN __________________ current project; 1950 GMC "Junk Yard Dawg" http://67-72chevytrucks.com/vboard/s...d.php?t=635960 ___________________________________________ SOLD to "ONEBADFIVEFIVE" http://67-72chevytrucks.com/vboard/s...d.php?t=436406

11-01-2009, 10:57 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Carb or fuel tank? you'd be amazed at how often the fuel filters are almost empty when the engine is running. I say don't call it fuel starvation, untill you crack open the carb and SEE the lack of ffuel. Tank location wouldn't have anything to do with it.

11-01-2009, 04:11 PM	#7
birdie Registered User Join Date: Nov 2005 Location: Rouleau, Saskatchewan Posts: 87	Re: Carb or fuel tank? Thanks for the replys, when the wife gets home I will go out and give some of your ideas a try. __________________ 1946 Chevy ton truck 1972 Chev C30 1975 Scottsdale C10

11-01-2009, 07:40 PM	#8
birdie Registered User Join Date: Nov 2005 Location: Rouleau, Saskatchewan Posts: 87	Re: Carb or fuel tank? Well I am pretty sure it is the carb. The next question is do I put in a carb kit or just get a rebuilt carb? It is a Quadrajet by the way __________________ 1946 Chevy ton truck 1972 Chev C30 1975 Scottsdale C10



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