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1966 Ford F-100 Carb. Leaks gas

Tiny
TWIGS
  • MEMBER
  • 1966 FORD F-100
  • 3.9L
  • 6 CYL
  • 2WD
  • MANUAL
  • 127,000 MILES
This is my second rebuilt carb installed. Each time we set up the carb it runs great in the shop. Then the trouble begins.I take out on the road go thru the gears it running ok. Then about a mile into the ride the engine wants to die.I get it back home barely and the engine dies. Open the hood and there is gas running down the Carb. The truck will not start again. Push it back into the garage let it sit for about 10-12 hrs. Then the truck will start but then dies after a bit and gas runs out the Carb. Got any ideas?
This is a 240cid 1 v carb Motorcraft 1101a
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Monday, November 25th, 2013 AT 12:44 PM

11 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So is gas overflowing over the bowl?If so that could be flooding the engine out. Some debris could be getting between the needle and seat causing the bowl to over flow or the float is set too high.
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Monday, November 25th, 2013 AT 1:26 PM
Tiny
TWIGS
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There is no debris visable. The bowl is set correctly. Gas runs out the bottom of the carb when the engine is shut off. Why can I start it a few hours later.
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Monday, November 25th, 2013 AT 2:10 PM
Tiny
SATURNTECH9
  • MECHANIC
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When it dies and won't start do you have spark? If its flooding out hours later the fuel will evaporates so it start. If your loosing spark the spark might be coming back hrs later after it cools down. The first thing I would fix is all the fuel leaking. That could cause a fire. So do you have a mechanical fuel pump or did you add a electric pump?Where's the fuel actually coming from if not overflowing from top of the bowl.
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Monday, November 25th, 2013 AT 2:39 PM
Tiny
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We do see that the spark is weak. We will try a new coil and point set/condenser. It's a mechanical gas pump with a can filter. Do you think it should also have an inlet filter. The leakage is below the main gasket.
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Monday, November 25th, 2013 AT 3:11 PM
Tiny
SATURNTECH9
  • MECHANIC
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So the fuel is leaking at the base gasket of the carb where it Mounts to the intake manifold?Also can you take a pic of the carb I can't seem to find a pic of one. It looks like the fuel inlet nipple might be a fuel filter
Not sure that's I would like to see a pic.
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Monday, November 25th, 2013 AT 4:18 PM
Tiny
TWIGS
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  • 14 POSTS
I looks like this one
Image (Click to make bigger)
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Monday, November 25th, 2013 AT 4:22 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Here is the two filters I see the one without the steel housing is the only one I see that could fit on the carb.
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Monday, November 25th, 2013 AT 4:53 PM
Tiny
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Yep one goes into the fuel pump and the other is an inline filter.I'm not sure if this system is suppose to have both.
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Monday, November 25th, 2013 AT 4:57 PM
Tiny
SATURNTECH9
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I have little repair info on a truck this old. There is a sock on the fuel pick up though.
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Monday, November 25th, 2013 AT 6:47 PM
Tiny
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Ok. Well thanks for your help. If you know Harry tell him I got my Voltage Reg. Problem fixed. Had to put in a new new one.
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Monday, November 25th, 2013 AT 7:11 PM
Tiny
SATURNTECH9
  • MECHANIC
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So where is the fuel leaking on the carb?The base gasket doesn't have any fuel there. It must be running down from above there.
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Monday, November 25th, 2013 AT 7:25 PM

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