FIRST - are you 100$ sure its fuel?
Get a can of starting fluid. Spray some in the intake (small bits first, then a little more). If the car starts and dies, ITS FUEL. If the car does nothing - something else is wrong.
simple thing to try - switch the horn relay with the fuel pump relay. I believe they are the same on this car. If not - find the relay box for the fuel pump and replace it with one of the ones around it that look the same. If your horn doesn honk (or whatever your replacement relay controls starts acting wonky) then you have a bad relay
I would also look at the fuses. maybe one is loose.
Also, just in case I am crazy, check your battery terminal, take it off clean it and tighten it back down. Just a suspicion.
Assuming this is fuel / fuel pump related - you need to make sure you dont have a bad wire somewhere. Do you live around mice? They do enjoy a good feast of ford wiring every now and again. you could have a wire that is giving you trouble.