Hopefully its not full of gas. Loosen the hose clamps for your filler tube just below the neck inside the fenderwell. With a jack under the tank, loosen the bolts that hold the tank in place, lower it a little bit, on top of the tank you will see an oval wire plug that will lift straight up, remove that. Pull the rubber vent line off of the vent valve, now the two gas lines. One will have a white plastic lock that slides down into the connector. you will need to use a small screwdriver to get under the clip to pry it up and off. the same goes for the othe gas line, but the plastic lock will be black. pay attention which one goes where for installing it back together. Be careful when pulling the lines off, due to there may be some fuel pressure in the lines. nothing a rag can't handle while taking the lines off. It would be a good idea to buy a new white and black clip before you start. Since most of the time they break when taken apart. Also the age of your truck you might want to consider buyung new tank straps. They just turn to remove the one end that doesn't bolt. Just reverse the procedure to install. Its also best to inst the new clips before the lins are put on. That way, all you have to due is push the gas lines on until you here them click into place. Once done, cycle the key on a couple of times to make sure nothing is leaking.
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SOURCE: 1989 Ford F150 power window
you have to disconnect the negative side of the battery so you won't kill it then remove the door panel look for hidden screws behind the arm rest and behind what looks like little doors that you have to use a screw driver to open once that is removed you will find a plastic sheet just cut and peel this back (you can use duct tape to replace it when you are done) also put on gloves because inside the doors there is sharp edges, you then can see the motor and you will need to break off the rivets but you can put the new one on with just a small bolt and nut and use lock tight
SOURCE: 1990 Ford F150 won't start after running out of gas
After running out of gas, the system is still full of air/vapor. In the fuel injection system, the pump will run momentarily each time the ignition is turned on. You should be able to hear the pump. Each time the pump runs it purges some of the air through the return line back to the tank. Try turning the ignition on and off about 10 - 20 times to purge the air and vapor and fill the system back full of gas.
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SOURCE: correct eec for 1989 ford f150 5.8l
Here is a listing of all possible computer modules for that truck. Perhaps this will help in some way in your search.
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AL1A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AL1B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AL2A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AL2B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-ALA
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-ALB
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AN1A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AN1B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AN2A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AN2B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-ANA
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-ANB
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AP1A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AP1B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AP2A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-AP2B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-APA
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Calif, ID E8TF-APB
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), High Altitude
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AK1A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E8TF-AK2A
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E9TF-Z1B
Elec Cont Unit (ECU), 8-351W (5.8L), (AT), Fed, ID E9TF-Z2B
SOURCE: 1989 Ford F150 Lariat Dual tanks...rear tank is
Thet don't have a switching valve,the switch just turns on one pump or the other.
Ford dealer has a fix ,a short piece of line with a one way valve,just snaps on to both lines .simple install,just buy the part,they will know what you are talking about at the parts counter,
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