69 gmc sputters and dies when hot - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rmahaffey · 07-13-2012, 07:28 PM

First off i am not a mechanic but am fairly handy. anyway i bought a 69 gmc as a project and have been slowly working on it. previous owner was a mechanic who said engine was rebuilt and running great (now highly doubting that) finally ready to drive and when i get on the road it runs great till it gets hot then starts to sputter almost like it is not getting gas and will eventually die. if i pull over and let sit after about 5 to 10 min it will restart and drive until too hot and does it again. i have now replaced the fuel filter, distributor, fuel lines from carb (real close to block thought it was vapor lock) just ran again today and still doing it! help i am about to scap it and do something else!
Rob
(frustrated novice)

So.Cal.Super · 07-13-2012, 07:39 PM

Where is your fuel filter, before the pump or after?
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rmahaffey · 07-13-2012, 07:43 PM

after. had someone tell me it could be the starter selinoid but tired of spending money to just find out it is wrong.

So.Cal.Super · 07-13-2012, 07:50 PM

There's a similar thread right now about the same problem, do you get the whoosh if you pull the gas cap off after it dies?
Posted via Mobile Device

rmahaffey · 07-13-2012, 08:00 PM

ya i saw that but no. have driven with cap on and off with same result. my truck also has same carb but has the spacers so i know its not that.

rmahaffey · 07-13-2012, 08:38 PM

fyi has all new plugs and wires. dont know enough to do a full tune up. is it time to hire a mechanic?

**leddzepp** · 07-13-2012, 08:41 PM

Since you live in a scorching climate, this may be your problem: http://67-72chevytrucks.com/vboard/s...d.php?t=516736

rmahaffey · 07-16-2012, 07:49 PM

ok read your link and going to put a phenolic spacer on it. It is for a 4 barrel edelbrock so the question is 1" or 2" and what is the difference.

doubleb's69 · 07-16-2012, 11:00 PM

Mine had the same problem. I put on an aluminum intake and rerouted the fuel line away from the upper radiator hose and have since not had a problem. I also used intake gaskets with cross over block offs built in to reduce heat to the intake. I did not use a phenolic spacer but I also have a Holley so it may react different.

IMO I would think a 1" would be fine. The taller they are the more of a tunnel ram effect they give but it doesn't benefit a mild engine.

Don't give up on it. It is how one learns to do things.

Post some pics of your truck.

07-13-2012, 07:28 PM	#1
rmahaffey Registered User Join Date: Jul 2012 Location: florence az Posts: 6	69 gmc sputters and dies when hot First off i am not a mechanic but am fairly handy. anyway i bought a 69 gmc as a project and have been slowly working on it. previous owner was a mechanic who said engine was rebuilt and running great (now highly doubting that) finally ready to drive and when i get on the road it runs great till it gets hot then starts to sputter almost like it is not getting gas and will eventually die. if i pull over and let sit after about 5 to 10 min it will restart and drive until too hot and does it again. i have now replaced the fuel filter, distributor, fuel lines from carb (real close to block thought it was vapor lock) just ran again today and still doing it! help i am about to scap it and do something else! Rob (frustrated novice)

07-13-2012, 07:39 PM	#2
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: 69 gmc sputters and dies when hot Where is your fuel filter, before the pump or after? Posted via Mobile Device __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB

07-13-2012, 07:43 PM	#3
rmahaffey Registered User Join Date: Jul 2012 Location: florence az Posts: 6	Re: 69 gmc sputters and dies when hot after. had someone tell me it could be the starter selinoid but tired of spending money to just find out it is wrong.

07-13-2012, 07:50 PM	#4
So.Cal.Super It'll Buff Out! Join Date: Apr 2007 Location: San Diego Posts: 603	Re: 69 gmc sputters and dies when hot There's a similar thread right now about the same problem, do you get the whoosh if you pull the gas cap off after it dies? Posted via Mobile Device __________________ "Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB

07-13-2012, 08:00 PM	#5
rmahaffey Registered User Join Date: Jul 2012 Location: florence az Posts: 6	Re: 69 gmc sputters and dies when hot ya i saw that but no. have driven with cap on and off with same result. my truck also has same carb but has the spacers so i know its not that.

07-13-2012, 08:38 PM	#6
rmahaffey Registered User Join Date: Jul 2012 Location: florence az Posts: 6	Re: 69 gmc sputters and dies when hot fyi has all new plugs and wires. dont know enough to do a full tune up. is it time to hire a mechanic?

07-13-2012, 08:41 PM	#7
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,020	Re: 69 gmc sputters and dies when hot Since you live in a scorching climate, this may be your problem: http://67-72chevytrucks.com/vboard/s...d.php?t=516736 __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

07-16-2012, 07:49 PM	#8
rmahaffey Registered User Join Date: Jul 2012 Location: florence az Posts: 6	Re: 69 gmc sputters and dies when hot ok read your link and going to put a phenolic spacer on it. It is for a 4 barrel edelbrock so the question is 1" or 2" and what is the difference.

07-16-2012, 11:00 PM	#9
doubleb's69 Registered User Join Date: Aug 2010 Location: Des Moines, IA Posts: 1,241	Re: 69 gmc sputters and dies when hot Mine had the same problem. I put on an aluminum intake and rerouted the fuel line away from the upper radiator hose and have since not had a problem. I also used intake gaskets with cross over block offs built in to reduce heat to the intake. I did not use a phenolic spacer but I also have a Holley so it may react different. IMO I would think a 1" would be fine. The taller they are the more of a tunnel ram effect they give but it doesn't benefit a mild engine. Don't give up on it. It is how one learns to do things. Post some pics of your truck. __________________ Bud



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