Ford f100 fuel problems
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Freshman User
Joined: Jan 2015
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Ford f100 fuel problems
So i just dropped in a rebuilt 390 and i cant get it to pick up fuel from the tank i blew compressed air through all the lines and bought a new fuel pump the tank has at least 8 gallons in it the truck is in my driveway wich is pretty steep... Anybody have any ideas?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Whitepos72, Welcome to 
and the Bumpside Forum. 
I don't agree with the full to the top gas tank. Gas will gravity flow from the tank to the pump. You should be able to remove the tank side hose at the pump and gas run out. If not you have a blockage. I would blow air into the hose from the pump back to the tank with the cap off or loose to see if it started flowing. If the gas is flowing at the pump, then the pump should move it to the carb. Just wondering do you have a clear inline filter up on top that you can see if there is gas up there. You don't have to, I just happen to have one on mine, I can see gas in it.
I did have to pull my tank after rebuild, and sloshed around, pour it out from the filler a couple times to get rid of debree in the tank that was causing problems. Try that before you have to deal with a full tank.
John
and the Bumpside Forum. I don't agree with the full to the top gas tank. Gas will gravity flow from the tank to the pump. You should be able to remove the tank side hose at the pump and gas run out. If not you have a blockage. I would blow air into the hose from the pump back to the tank with the cap off or loose to see if it started flowing. If the gas is flowing at the pump, then the pump should move it to the carb. Just wondering do you have a clear inline filter up on top that you can see if there is gas up there. You don't have to, I just happen to have one on mine, I can see gas in it.
I did have to pull my tank after rebuild, and sloshed around, pour it out from the filler a couple times to get rid of debree in the tank that was causing problems. Try that before you have to deal with a full tank.
John
Logistics Pro
Joined: Jun 2003
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Huh? Please elaborate.
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Logistics Pro
Joined: Jun 2003
Posts: 3,921
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Take a tiny funnel or a squeeze bottle and fill the float bowl through the bowl vent tube. This should allow the motor to run long enough to pick up fuel from the tank.
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More Turbo
Joined: Feb 2014
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Jowiliker is right
If you remove the fuel line from the fuel pump/fuel filter....gas will just pour and pour and go all over the place with just gravity. If it doesn't, then you have a blockage somewhere toward the tank. Check your filter too.
But don't fill the tank....no need.
But don't fill the tank....no need.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Backfill the fuel line btwn the carb and the pump to create a vacuum on the opposite side of the fuel pump diaphram... use something like a turkey baster from the kitchen...
And if you do use a turkey baster, ya might oughtta buy a new one lest the wife/GF gets wind of what you used it for.
And if you do use a turkey baster, ya might oughtta buy a new one lest the wife/GF gets wind of what you used it for.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
John
Cargo Master
Joined: Mar 2014
Posts: 2,031
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I dont' if this well help at all. But I was experiencing something similar. I used a short piece of rubber hose, connected it to the intake on the fuel pump and then stuck the other end in a small portable gas can.
Also, I used compressed air and forced air back through the fuel line from the fuel pump to the gas tank. That helped get fuel to flow. Ended up cleaning out my fuel lines and then fuel tank.
Also, I used compressed air and forced air back through the fuel line from the fuel pump to the gas tank. That helped get fuel to flow. Ended up cleaning out my fuel lines and then fuel tank.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Senior User
Joined: Nov 2003
Posts: 318
Likes: 1
From: Cantonment, Fl
There is a short piece of rubber hose under the cab that connects the metal line from the tank to the metal line to the pump. This hose often rots with age and will get plugged. I have had this happen on several vehicles.