Help!Truck won't start - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rusted75 half ton · 03-11-2005, 10:04 AM

Hi,it started last week it stalled out a few times the finnally died,ans couldn't get it stated.It'll crank but won't fire off,a few times I can get it stated but it dies quikly.Sofar I checked the easiest problems,made sure there was gas in the tank!!and replaced the fuel filter.When it sits gas is making it's way up to the carb inlet.The truck is stock with a 396,stock intake and a chevy Q-jet carb.I don't know much about carbs so not sure what to look for.any help is appreciated

Longhorn Man · 03-11-2005, 10:09 AM

Does it still have a points distributor?
If you don't know the difference, just open the hood of the 75, if it look slike that one, then it is HEI. If it is much smaller, then you have points.
Points suck.They need constant adjustment and replacement.

rusted75 half ton · 03-11-2005, 10:21 AM

longhorn man it looks like HEI to me someone else looking at my truck said the same thing,but I'm gonna double chek,Thanks

86SILVERADO · 03-11-2005, 11:27 AM

Sounds like it might be possibly the inlet needle not seating and the carb could be flooding out on you. Also the float can cause this to happen because they get saturated with fuel over time and will hang lower and put less pressure on the needle valve.

86SILVERADO · 03-11-2005, 11:29 AM

Also Vacuum leaks, Vacuum leaks, Vacuum leaks. And Check to make sure PCV valve isn't stuck. Shake it back and forth and make sure it rattles.

03-11-2005, 10:04 AM	#1
rusted75 half ton More trusty Less rusty Join Date: May 2004 Location: Lakewood,Colorado Posts: 152	Help!Truck won't start Hi,it started last week it stalled out a few times the finnally died,ans couldn't get it stated.It'll crank but won't fire off,a few times I can get it stated but it dies quikly.Sofar I checked the easiest problems,made sure there was gas in the tank!!and replaced the fuel filter.When it sits gas is making it's way up to the carb inlet.The truck is stock with a 396,stock intake and a chevy Q-jet carb.I don't know much about carbs so not sure what to look for.any help is appreciated

03-11-2005, 11:27 AM	#4
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	Sounds like it might be possibly the inlet needle not seating and the carb could be flooding out on you. Also the float can cause this to happen because they get saturated with fuel over time and will hang lower and put less pressure on the needle valve. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

03-11-2005, 11:29 AM	#5
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	Also Vacuum leaks, Vacuum leaks, Vacuum leaks. And Check to make sure PCV valve isn't stuck. Shake it back and forth and make sure it rattles. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

03-11-2005, 10:09 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Does it still have a points distributor? If you don't know the difference, just open the hood of the 75, if it look slike that one, then it is HEI. If it is much smaller, then you have points. Points suck.They need constant adjustment and replacement.

03-11-2005, 10:21 AM	#3
rusted75 half ton More trusty Less rusty Join Date: May 2004 Location: Lakewood,Colorado Posts: 152	longhorn man it looks like HEI to me someone else looking at my truck said the same thing,but I'm gonna double chek,Thanks



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