FirstFord89

Hi. My son and I were given a 1989 F-150 4x4 with a fuel injected 300ci straight six for him to fix for his 16th birthday. The truck sat for two years, and wasn't well maintained when operating. We've managed to correct no cranking and no spark. We're now stuck on no fuel to the fuel rail.

A colleage at work has an early '90s F-150 and you can hear the fuel pumps activate for a few seconds when the key is turned. My truck makes no sounds at all.

So far I've checked the actual fuel amount, and added new gas. I checked the Schraeder (sp?) fitting and no gas came out of it. I've cleaned all the obvious ground points, and checked the inertia switch (the button wasn't up, but I pushed on it just in case). I found and replaced the fuel pump relay. No change. I held the relay when the switch was turned, and couldn't feel any "bump" indicating the relay was engaging. I ran a direct ground to the battery with a test light and had my son turn the key. I had power to the sending unit at the tank pig-tail, but no power to any other line.

I'm not a mechanic, just a tinkerer and have the general hand tools. I did get a wiring diagram, but its somewhat less than helpful. What I really need is a Fuel Injection for Dummies kinda' thing. For example ground the tan/white wire on the relay end and see if the pumps start.. or jump the red and yellow wires at the relay end.. that should activate the pumps. If that works the fault is in the front of truck somewhere... that kinda' thing.

Its been a great father/son project..and its a cool truck. I'd like to be able to help him finish it and get it on the road... THANKS!!