I have a 1990 Ford F 150. I turn the truck off and the fuel pump continues to run. I have a small problem with my ignition lock cylinder. Could this be part of the problem???

bad ignition lock cylinder

Hello HK.
I have seen this happen quite a few times back when I worked at Ford.
The fuel pump relay contact is sticking.
You will find it on the front left top fender under the hood. There is a black housing that houses two relays. The relays are pushed in from below the box.
The one with the green cover is the fuel pump relay.
Replace that one, it should repair your problem.

Thank you for using FixYa.

KL

look UNDER the ignition,there is a small hole there. insert a small screwdriver or nail in it and press it in,whie turning the key....and then just pull ouy the key...the lock cylinder will come out with it. you can buy a new lock and key cylinder at autozone for about ten bucks.

have the fuel pressure check

Change the fuel pump its faulty.

Hi there it is most likely dirt in the fuel filter,when you run out of gas you bring up all the crud from the bottom of the tank and if your lucky enough that it hasnt ruined your fuel pump it should be just the fuel filter needs the dirt blown out of it a really easy job to do good luck

Check the power supply going into the fuel pump relay. If it is still hot when the ignition is off then your ignition switch is probably the problem.

Ignition Lock Cylinder
Ford Taurus/Sable 1986-1995 Repair Information





REMOVAL & INSTALLATION

Functional Lock


The following procedure applies to vehicles that have functional lock cylinders. Such cylinders either have a key available or known key numbers from which a key can be made.

1. Disconnect the negative battery cable.
   
2. Turn the lock cylinder key to the RUN position.
   
3. Using a 1/8 in. (3mm) diameter wire pin or a small drift, depress the lock cylinder retaining pin through the access hole in the upper steering column shroud (under the ignition lock cylinder) while pulling out on the lock cylinder. Remove the lock cylinder from the column.
   

Using the key, turn the ignition lock cylinder to the RUN position, then depress the retaining pin using a wire pin or small drift

To install:

1. Install the lock cylinder by turning it to the RUN position and depressing the retaining pin. Insert the lock cylinder into its housing. Make sure the cylinder is fully seated and aligned in the interlocking washer before turning the key to the OFF position. This will permit the cylinder retaining pin to extend into the cylinder housing.
   
2. Rotate the lock cylinder using the lock cylinder key, to ensure correct mechanical operation in all positions.
   
3. Connect the negative battery cable.
   

Non-Functional Lock
The following procedure applies to vehicles in which the ignition lock is inoperative and the lock cylinder cannot be rotated due to a lost or broken key, unknown key number or a lock cylinder cap that has been damaged and/or broken to the extent that the lock cylinder cannot be rotated.

check to see if you have a flapper valve that operates your feul injection if you do you might have to replace it.

Sounds like a clog somewhere.