1979 f150 problem
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8th Gear
Joined: Sep 2023
Posts: 8
Likes: 1
1979 f150 problem
I have a 79 f150, 351m, c6. It does this thing where after running for a little bit it will cut out and then whenever u hit the gas at all it will kill it. a little trick i’ve been doing is taking off the fuel line, starting it and idling itself out of gas, putting the fuel line back on, and then it’ll run again like before. anyone have any insight on what this could be?
Desk Jockey
Joined: Sep 2021
Posts: 1,068
Likes: 425
From: Raleigh, NC
Weird. What fuel line are you removing and why?When it dies, is there gas in the carb when you look down it? Is the choke open, closed? Sounds like a choke issue but I’m guessing without more information.
Mountain Pass
Joined: Sep 2004
Posts: 127
Likes: 29
From: s/e iowa
possible vapor lock, is "running for a little bit' mean its at normal operating temp? when the carb is "idling out of gas" do you have fuel squirting out of the fuel line?
if vapor lock, i have increased the air space between the metal fuel line and the engine block/intake manifold. also, ethanol fuel would vapor lock my buddy's boat with a small block chevy.
if vapor lock, i have increased the air space between the metal fuel line and the engine block/intake manifold. also, ethanol fuel would vapor lock my buddy's boat with a small block chevy.
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8th Gear
Joined: Sep 2023
Posts: 8
Likes: 1
I take off the rubber line that goes directly into the carb. The only reason why I did this the first time was to check if it was getting fuel, and then when I put it back on it ran like it did at the beginning. There is not gas when I look down it. Choke is open.
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8th Gear
Joined: Sep 2023
Posts: 8
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Yes, normal operating temp, may run a little hot, but it always has. Yes there is fuel coming out of the line when I take off that line and idle it out of gas. I also tried the clothes pin trick, but it didn't help none, unless if I did it wrong(and yes I used wood not plastic clothes pins).
Desk Jockey
Joined: Sep 2021
Posts: 1,068
Likes: 425
From: Raleigh, NC
What I would do….
Run it normal until it acts up.
Safely pull over.
Open hood and remove air cleaner.
Inspect choke.
Are you at operating temp?
Is choke wide open? If so, check.
If not, adjust choke.
Inspect carb.
push throttle and watch inside carb.
Squirting two solid streams?
If yes, check.
If not, check for blockage, bad connection etc.
If these don’t fix it, I’d move into the carb. But try these first.
Run it normal until it acts up.
Safely pull over.
Open hood and remove air cleaner.
Inspect choke.
Are you at operating temp?
Is choke wide open? If so, check.
If not, adjust choke.
Inspect carb.
push throttle and watch inside carb.
Squirting two solid streams?
If yes, check.
If not, check for blockage, bad connection etc.
If these don’t fix it, I’d move into the carb. But try these first.
Lead Driver
Joined: Mar 2004
Posts: 8,922
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FTE Legend
Joined: Nov 2015
Posts: 30,917
Likes: 4,123
From: Angier, NC
Well it stops running
It is up to temp
There is gas at the fuel line at the carb.
You can let it idle so there is gas in the carb float bowl
Where is the fuel line when you let it idle, on or off carb?
I dont understand " it will cut out and then whenever u hit the gas at all it will kill it."?
When it cuts out is it like running out of gas or you turned the key off?
Try running it with the gas cap off.
Also if you have not done so replace all rubber fuel lines with new.
Todays fuel eats the old from the inside out and can clog and not let fuel thru.
It may not be a fuel thing but a spark thing.
Swap out the ICM for a non-cheap (yes more money one) and see if that fixes it.
I am thinking the ICM is heating up and causing the problem.
You open the hood to check / idle and you let the heat out cooling the ICM and it will now run.
I have seen it posted the ICM's fail in different way not just NO SPARK!
Dave ----
It is up to temp
There is gas at the fuel line at the carb.
You can let it idle so there is gas in the carb float bowl
Where is the fuel line when you let it idle, on or off carb?
I dont understand " it will cut out and then whenever u hit the gas at all it will kill it."?
When it cuts out is it like running out of gas or you turned the key off?
Try running it with the gas cap off.
Also if you have not done so replace all rubber fuel lines with new.
Todays fuel eats the old from the inside out and can clog and not let fuel thru.
It may not be a fuel thing but a spark thing.
Swap out the ICM for a non-cheap (yes more money one) and see if that fixes it.
I am thinking the ICM is heating up and causing the problem.
You open the hood to check / idle and you let the heat out cooling the ICM and it will now run.
I have seen it posted the ICM's fail in different way not just NO SPARK!
Dave ----
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