1991 Ford F150 Long bed XLT 302 automatic. Driving down the road and dies. Turns over but will not restart. Towed it home. This is my fathers truck.
Do not hear fuel pump when turning the truck on. Only use rear tank. Front tank has not been used in years. Replace rear fuel pump. Still turns over but does not start. Do not hear fuel pump. Change Fuel pump relay. Still turns over but does not start.
Does not seem to get spark to the plugs. change coil, change distributor, change the brain on the side of the distributor and change the brain on the truck. Still turns over but does not start.
what next? Hopefully it's something simple that we have overlooked. Going crazy trying to get it running.

 

check all the fuses and relays. did u replace cap rotor wires and plugs? does the fuel pump prime now or is it still not workin. did u check the eec see if it had a burnt smell

 

Relays are new. checked fuses. New cap and rotor. Do not hear the fuel pump prime. Button for fuel under dash is pushed in. EEC did not smell burnt but did replace it.

 

are u getting voltage at the conector?on the front side of the crossmember of the gas tank ware the wires comming from the sending unit come over and go into a conector see if u got voltage there. if not work your way back check the tank selector switch everything.

did u get a whole fuelpump/sending unit assembly or just the pump? if pump did u shrink wrap the wires

 

Bought the whole assembly. Haven't changed the selector switch. But it does show how much gas is in the rear tank when switched to the rear tank. I'll have to check if power is getting to the pump. It does not prime when key is turned on.

 

my buddys f150 did the same thing and the computer went bad but didnt smell.
best i can say is trace it back till you find power get a chiltons so u can find the wires easy

 

No power to the pump. But the guage has power. No power at the relay. I can not get any codes because it doesn't show any. I tried jumping the fuel pump at the code testing wires and still no pump.
The tank selector switch shows the back tank has gas when you put it on the back tank (put 7 or 8 gallons in after I put in the new fuel pump) and the front shows empty when it's on the front tank. Can the switch still be bad?

 

check the maxi fuse power goes to that before the relay see if u got power there

 

maxi fuse?

 

if i remember correctly its the to fuse
they look like the fuses under the dash but alot bigger
they are right to the left of the relays under the hood

but i dont remember if the 91 used this set up if not check all your regular fuses i know 92+ are like this

 

91 is not like that. I've checked every fuse and relay on this truck. Going to put it in the shop and let them figure it out.

 

Yes, the tank switch can be 1/2 bad. Pull it & check for 12V going in AND coming out. These are the wire colors:

 

It ended up being a connector was corroded. There are about 4 or 5 connectors below the relays. It was one of those. Cleaned it up and the truck started. Found it by accident.