If the relays are working and the truck is running fine I would just drive it.

 

Subford, I have a similar problem with a 1986 F150 XLT 5.0 efi with dual tanks. No power to any pumps. If I jump out my test connector the truck runs fine. Any idea where to go next?

 

If you are grounding pin #6 of the self-test connector and it runs and will not run when it is not grounded then either the wire is open from the self-test connector to the computer, the computers pin #22 is pushed out or wire the wire is broken off of it or you have a bad EEC Computer.

 

Jumped #2 to #6, to make it run, was that correct?. Thanks for the reply, I will attack it some more on the weekend.

 

Yes that is correct.

 

Im having the same problem with my 88. Its driving me nuts. I ground out the fuel pump relay which i believe is pin 6 the fuel pump goes on and WHEN it starts itll run but eventually stall. Im going to try and jump 2 and 6 tomorrow morning sometime. As soon as i get it running im selling. !!!!