i got a 81 f150 and ever time i go to fill up at the gas station and i start pumping i lock the nozzle so it will keep pumping gas till my tank is full but the pump always shuts off (at every gas station) is there somthing wrong with my tank or filler neck???? thanx

 

Mine (81F150) does the same thing sometimes, so I just auto pump it at a lower flow.

Maybe it's some sort of splash back that's causing it to shut off.

I'm curious too.

 

Same with my 82 F150.

 

There is a little tube that goes inside the fuel filler hose that allows air to escape when filling up. I have a picture of it here......

http://www.marketswing.com/Temporary/Fuel%20Tank%20Vent%20Tube.jpg

Either yours are pinched or else missing frm when someone dropped the tank at some time in the past. It runs as in the picture to a little 'notch' in the metal fuel access nozzle.

Replace it and your problems go away.

Good Luck,

Lee

 

Since I just fixed this problem for a friend who replaced his rear tank, here's how you do it, and it usually doesn't require a new anti-siphon hose.

1. Loosen the two hose clamps. One braces the metal filler tube to the underbody and the other one secures the filler tube to the rubber tube connected to the gas tank.

2. Remove the three tiny nuts and surround ring holding the metal filler tube in place behind the filler door.

3. For the rear tank, remove the metal filler tube by moving it forward toward the rear wheel to separate it from the rubber tube attached to the tank.

4. Remove the anti-siphon tube from the metal filler tube.

5. This is the most important step in proper installation. Insert the anti-siphon line into the rubber filler tube that attaches to the tank FIRST. You will feel the flexible plastic tube engage an opening in the tank and then keep moving it in as far as it will go.

6. Now line up the metal filler tube with the rubber tube that goes to the tank - make sure the hose clamps are still on the metal tube - and slip the anti-siphon tube into the slot in the metal filler tube and press the entire assembly into the rubber filler tube as you line up the metal tube with the opening in the bed sheet metal.

7. Reattach the metal surround ring inside the gas filler door and screw the three tiny nuts back in. Tighten the hose clamps and fill her up while you're getting coffee inside.

 

If you or someone tried to siphon gas out of the tank in the past with a hose, they could have damaged the vent tube inside the filler neck.

Replacement is usually required in that instance.

Most of those plastic tubes though are interchangeable on the 1980 to 1996 F-series.

I have a new vent tube in the filler of my rear tank for my 1981, that came out of a 1992, and it works great.

Someone tried to steal gas from me and completley crushed the original one, to where I couldn't put any gas into the tank at all. The "hackensaky-hockypuckers"!

 

Three words...locking gas caps.

 

Nine words.

Locking gas cap and bear trap on the ground.

 

$3.00 gas = what locking gas cap? Thieves can steal the whole truck in under a minute, so to them a locking gas cap is just another easy open container...

 

Thieves are not going to steal a vehicle for the gas, but what ever is on it or in it.

Where you parked at?