electrical/fule delivery problem

my 87 s-10 blazer died on me, and once i got it towed home, i tried to pinpoint the problem. so, the fuel pump doesn't run upon setting the key/ignition to run (it shoud run a few seconds before shutting off in run position prior to twisting key to start). also, the fuse for horn/dm keeps blowing. now, i know the horn has nothing to do with the fuel delivery, and the dome light shouldn't either (true?). but what hidden connection am i missing here? there's something funny going on, and the 20 amp fuse in this slot so blowing upon replacement, and the truck won't start or go (fuel pump not running). i don't want to have to remove 13 gallons of gas, drop the tank, and check/replace the fuel pump if there's some other short circuit i could be dealing with.

any advice or knowledge about this scenario out there?

thanks-
henderson

no sugestions except if you have to pull the tank to replace the fuel pump it might be a good time to drop in a 20 gallon