1973 Ford F-100 F100 390 4bbl

Tiny
JUMPSHOT23
  • MEMBER
  • 1973 FORD F-100
  • 6.7L
  • V8
  • 4WD
  • MANUAL
  • 237,000 MILES
Rebuilt carb. 750 Holley dbbl. Pump with electric choke truck will run then it will just shut off try to restart it starts but shuts off again seems worse in cold weather. What could be the problem bad fuel pump or fuel filter?
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Friday, December 20th, 2013 AT 5:15 PM

12 Replies

Tiny
CARADIODOC
  • EXPERT
Sure could use a lot more detail. How long does it run? A minute? An hour? Does it shut off at highway speed? Have you looked down the middle of the carburetor to see if there's two nice strong sprays of fuel when you work the throttle by hand? Have you checked for loss of spark?
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Friday, December 20th, 2013 AT 9:09 PM
Tiny
JUMPSHOT23
  • MEMBER
Runs for about a minute, then shuts off it will start back up but it will shut off again does have spark.
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Saturday, January 4th, 2014 AT 3:48 PM
Tiny
CARADIODOC
  • EXPERT
Have you looked down the middle of the carburetor to see if there's two nice strong sprays of fuel when you work the throttle by hand?

If you're losing fuel, a good suspect is the pickup screen in the gas tank. They will collapse and block the pipe, then will slowly stretch out again when the engine is stopped.

Also look around the tank for wetness indicating a leak. If that leak is up high enough, air will get sucked in rather than fuel getting drawn from the tank.
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Sunday, January 5th, 2014 AT 1:50 AM
Tiny
JUMPSHOT23
  • MEMBER
Turns out, my gas went bad. Emptied fuel tank and lines, carb. Put fresh gas in and she purrs like a kitten. Thanks for your help
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Saturday, January 18th, 2014 AT 8:12 PM
Tiny
CARADIODOC
  • EXPERT
I'm happy it's running, but how did it start and run for a minute if the gas went bad?
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Sunday, January 19th, 2014 AT 1:12 AM
Tiny
JUMPSHOT23
  • MEMBER
Your right, went out the next day and it does the same thing. Starts runs for alittle bit then shuts off. Back to square one?
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Monday, January 20th, 2014 AT 5:54 PM
Tiny
CARADIODOC
  • EXPERT
Did you replace the sock on the end of the pickup tube?
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Tuesday, January 21st, 2014 AT 11:30 AM
Tiny
JUMPSHOT23
  • MEMBER
Truck has a racing tank in the back of the bed. Talked to my mechanic and he suspects dirt in the needle and seats, he also said some of the needle and seats are not made for the newer ethanol treated gas. Took carb. Off and cleaned and did see some black pieces of what looked like hose material. Did not get it back on truck yet to see if she'll run or not, it's been too cold out! Thanks again for your imput.
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Friday, January 24th, 2014 AT 6:42 PM
Tiny
CARADIODOC
  • EXPERT
Have you solved the problem? I don't think the ethanol is the issue. I have three cars with carburetors and don't have an issue. There originally was concern that the alcohol would act as a cleaner and break off pieces of debris that would clog filters, but the problems seem to be more common when the fuel sits a long time. People who use ethanol in generators, compactors, and cement mixers on the job don't seem to have trouble either. A friend who runs a small engine repair shop showed me a jar of old ethanol, and it was cloudy from mold growing in it. That is supposedly what plugs things up.

This isn't my area of expertise, and I have no reason to doubt my friend. This is just offered for your consideration.
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Tuesday, February 18th, 2014 AT 1:12 AM
Tiny
JUMPSHOT23
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Turned out to be the fuel pump. It's been running since I changed it. Also it was leaking from the backside of the pump, and gas got into the oil. Changed oil and filter going to run it for allittle while then change oil and filter again. So thats where i'm at with my baby. Thanks for your imput.
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Friday, February 21st, 2014 AT 3:31 PM
Tiny
CARADIODOC
  • EXPERT
Dandy. I'm happy you knew to get that oil out of there.
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Friday, February 21st, 2014 AT 4:19 PM
Tiny
JUMPSHOT23
  • MEMBER
I think it should be okay, it was'nt leaking long in the oil and I did'nt drive the truck that much since I bought it. Thanks again for your help. Have a good day.
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Friday, February 21st, 2014 AT 6:20 PM

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