My 1990 Ford Bronco (300 I6) fuel pump doesn't want to turn on.

Awhile back I washed the engine out but it did run with no problem afterwards. Then one day I was leaving work, the fuel pump didn't want to turn on. I went and got a relay for it and the pump came on. Well it did it again another day but I wiggled or did something to the relay and the pump came on. It ran good for like a week and now yesterday the pump doesn't want to come on.

My fuel relay isn't clicking but the other relay is. I went and bought another fuel relay and it doesn't want to click. ANY IDEAS WHAT THE PROBLEM IS?!?!

I check the ground on the driverside and it is fine.

 

I think we have found the problem. Where does the thick yellow wire go to from the fuel pump relay?

We hooked up a wire from the battery to the terminal where the yellow wire runs to the fuel relay and the truck cranked up.

Is the ignition switch gone?

 

Check/replace the inertia switch behind the driver's side kick panel. Loose connections or a tripped switch will cause the symptoms you are describing. The switch has a red plunger in the top that pops up if it is tripped. Its designed to cut fuel supply in the event of a collision however as they get old, the connections get weak between it and the harness and sometimes the latching mechanism weakens causing false tripping.

 

It looks fine. The swtich isn't tripped.

Where does the thick yellow wire from the fuel relay terminal go? I think that is the problem.