Truck keeps stalling out please help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 Donkey · 09-28-2015, 06:01 PM

I have 68 C10 with a mid 80's SBC and a 350 automatic transmission. Everything on the engine is new expect the fuel pump and plug wires. My problem is the truck will run fine for a few miles then it begins to stall. I work the gas to keep it running. The problem is intermitting and the engine may be hot or cold. We have set the timing and vacuum. We idle it up because it wants to stall when put in drive. I went as far as having the torque converter checked.
The Quck fuel carb is brand new too. Please help. Any suggestion appreciated.

Redline novdog · 09-28-2015, 07:34 PM

might not just be the fuel pump. Is the pickup clear in the fuel tank? I seen fuel socks(tank pickup filters) get partially clogged and closes off fuel supply at any time or temp.Just an FYI.

Andy4639 · 09-28-2015, 08:06 PM

Does it do it at 1/2 a tank and below more than when full? Could be a bad sock are it could be a vacuum being pulled on the tank.

leftybass209 · 09-28-2015, 08:56 PM

New parts don't always mean working parts. What condition is your fuel line and filter in?

**LockDoc** · 09-28-2015, 11:03 PM

Quote:

Originally Posted by 68 Donkey

I have 68 C10 with a mid 80's SBC and a 350 automatic transmission. Everything on the engine is new expect the fuel pump and plug wires. My problem is the truck will run fine for a few miles then it begins to stall. I work the gas to keep it running. The problem is intermitting and the engine may be hot or cold. We have set the timing and vacuum. We idle it up because it wants to stall when put in drive. I went as far as having the torque converter checked.
The Quck fuel carb is brand new too. Please help. Any suggestion appreciated.

Next time it does it try removing the fuel cap and see if it sucks air in when you loosen it up. Could be pulling a vacuum like Andy said. Do you have a fuel filter on it? If so where is it?

LockDoc

cooperhw · 09-28-2015, 11:45 PM

YOu might want to try adjusting the arm that drives the accelerator pump. You would be surprised by how much grief those can give if they are "feeding fuel" by the arm pushing down even slightly. Holley says there is supposed to be a "slight drag" on a 0015 feeler gauge when inserted between the arm bottom and the pump arm. Adjust it till it does not touch and then adjust back towards the arm.
JMO

swamp rat · 09-30-2015, 02:22 AM

New engine? did the intake get retorqed? I had a stalling problem and was frustrated as no amount of tuning seemed to help, it would be fine then 2 minutes later the stalling and not wanting to idle would start again, it turned out my intake had loosened up and the cheapo intake gaskets had saturated with coolant and failed, replaced with better quality gaskets and resealed the threads going into the water jacket with the correct sealant and no problems since.

smoked68 · 09-30-2015, 12:29 PM

I had a fuel pump that must have had a small hole in the diaphragm. It was just as you describe. I replace with a cheapo advance one then when I was sure it was fixed put a holley pump on it. Been running great since.

kehstr · 10-01-2015, 05:46 PM

sounds to me like it's vapor locking, is it a manual or electric fuel pump

Harley03joe · 04-24-2017, 04:00 PM

I Just Put In 2 Sending Units And Fuel Pumps In The 2 Fuel Tanks In My 87 F I 5.7 Eng Silverardo Along With A New Fuel Filter $1600.00 Later My Truck Still Keeps Stalling When Warmed Up.

I Also Changed The Spark Plugs & Cap & Rota.
And Still Stalls Out When Warmed Up, Also It Does Idle Fast When Cold The Drops Down To Normal When Warmed Up But Always Starts Right Up
Any Help Here Could It Be The IAC Or Coil ???
Please Let Me Know OK Or Any Ideas
Thank You All
Harley03joe

09-28-2015, 06:01 PM	#1
68 Donkey Registered User Join Date: Sep 2015 Location: Wesley Chapel ,FL Posts: 13	Truck keeps stalling out please help I have 68 C10 with a mid 80's SBC and a 350 automatic transmission. Everything on the engine is new expect the fuel pump and plug wires. My problem is the truck will run fine for a few miles then it begins to stall. I work the gas to keep it running. The problem is intermitting and the engine may be hot or cold. We have set the timing and vacuum. We idle it up because it wants to stall when put in drive. I went as far as having the torque converter checked. The Quck fuel carb is brand new too. Please help. Any suggestion appreciated.

09-28-2015, 07:34 PM	#2
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: Truck keeps stalling out please help might not just be the fuel pump. Is the pickup clear in the fuel tank? I seen fuel socks(tank pickup filters) get partially clogged and closes off fuel supply at any time or temp.Just an FYI. __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS

09-28-2015, 08:06 PM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Truck keeps stalling out please help Does it do it at 1/2 a tank and below more than when full? Could be a bad sock are it could be a vacuum being pulled on the tank. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-28-2015, 08:56 PM	#4
leftybass209 Registered User Join Date: Feb 2011 Location: Modesto, CA Posts: 2,189	Re: Truck keeps stalling out please help New parts don't always mean working parts. What condition is your fuel line and filter in?

09-28-2015, 11:45 PM	#6
cooperhw Registered User Join Date: Oct 2014 Location: Mesa AZ (Near Phoenix) Posts: 2,303	Re: Truck keeps stalling out please help YOu might want to try adjusting the arm that drives the accelerator pump. You would be surprised by how much grief those can give if they are "feeding fuel" by the arm pushing down even slightly. Holley says there is supposed to be a "slight drag" on a 0015 feeler gauge when inserted between the arm bottom and the pump arm. Adjust it till it does not touch and then adjust back towards the arm. JMO __________________ "Life is too short to drive a boring vehicle". Later, Wayne

09-30-2015, 02:22 AM	#7
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Truck keeps stalling out please help New engine? did the intake get retorqed? I had a stalling problem and was frustrated as no amount of tuning seemed to help, it would be fine then 2 minutes later the stalling and not wanting to idle would start again, it turned out my intake had loosened up and the cheapo intake gaskets had saturated with coolant and failed, replaced with better quality gaskets and resealed the threads going into the water jacket with the correct sealant and no problems since. __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

09-30-2015, 12:29 PM	#8
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Re: Truck keeps stalling out please help I had a fuel pump that must have had a small hole in the diaphragm. It was just as you describe. I replace with a cheapo advance one then when I was sure it was fixed put a holley pump on it. Been running great since. __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom

10-01-2015, 05:46 PM	#9
kehstr Registered User Join Date: Mar 2015 Location: Utah Posts: 751	Re: Truck keeps stalling out please help sounds to me like it's vapor locking, is it a manual or electric fuel pump

04-24-2017, 04:00 PM	#10
Harley03joe Registered User Join Date: Apr 2016 Location: Miramar Florida Posts: 153	Re: Truck keeps stalling out please help I Just Put In 2 Sending Units And Fuel Pumps In The 2 Fuel Tanks In My 87 F I 5.7 Eng Silverardo Along With A New Fuel Filter $1600.00 Later My Truck Still Keeps Stalling When Warmed Up. I Also Changed The Spark Plugs & Cap & Rota. And Still Stalls Out When Warmed Up, Also It Does Idle Fast When Cold The Drops Down To Normal When Warmed Up But Always Starts Right Up Any Help Here Could It Be The IAC Or Coil ??? Please Let Me Know OK Or Any Ideas Thank You All Harley03joe Last edited by Harley03joe; 04-26-2017 at 02:50 AM.



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