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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

56 F100 gas tank troubles

 
  #1  
Old 09-23-2013, 02:50 PM
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56 F100 gas tank troubles

Recently brought my F100 out of a 10 year hibernation. My parents made a visit to Jacksonville,FL from Michigan and brought the truck with them.

After unloading the truck my dad and I had it back up and running in short order. Enough to take it up and down the street in front of the house. It sat for a week or so, and now it isn't getting fuel to the carb. I have a frame mounted electric pump that runs but doesn't seem to push fuel. Simple right? I think some sediment has clogged the pump...working on that seperately.

What is rather bothering to me, is that when disconnecting the lines to the pump, the inlet line (outlet from the gas tank) pours out fuel. It'll keep running out until plugging or clamping the line off.

What is causing this? The tank has a top outlet which has me confused why fuel would continue to flow out of the tank.

I have a long list of maintenance items to take care of, but here's an as it sits picture.


 
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Old 09-23-2013, 03:07 PM
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Siphon effect....
 
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Old 09-23-2013, 03:12 PM
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Yup it's siphoning. There is still a rubber line that goes to the bottom of the tank and that is STILL above the level of the line to your fuel pump. If you can get that hose above the bottom of your tank it will stop.
 
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Old 09-23-2013, 03:40 PM
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So simple, I'm embarrased that it escaped me.
 
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Old 09-23-2013, 03:48 PM
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Originally Posted by ohbrian View Post
Yup it's siphoning. There is still a rubber line that goes to the bottom of the tank and that is STILL above the level of the line to your fuel pump. If you can get that hose above the bottom of your tank it will stop.
It'll only stop when it's raised above the level of the fuel in the tank, not the tank bottom itself!
 
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Old 09-23-2013, 04:25 PM
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Yeah what you said I should know this since I spent yesterday covered in gasoline as I replaced my tank hahaha.

Originally Posted by Normalbloke View Post
It'll only stop when it's raised above the level of the fuel in the tank, not the tank bottom itself!
 
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Old 09-23-2013, 07:28 PM
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Nice looking truck by the way. Stock Y block?
 
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Old 09-23-2013, 09:29 PM
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Lincoln 317
 
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Old 09-23-2013, 11:14 PM
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Originally Posted by ohbrian View Post
Yeah what you said I should know this since I spent yesterday covered in gasoline as I replaced my tank hahaha.
Ah, covered in gasoline... Nothing like it!

Welcome to the hobby!
 
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Old 09-23-2013, 11:19 PM
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Wow that is nice!
 
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Old 09-24-2013, 08:11 AM
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Welcome, nice truck!
 
 
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