Fuel Pump/Fuel Injector Fuse Blows

93 Grand AM 3.3 is intermittantly blowing the FP/FInj fuse. It may blow twice a day or go for a week without blowing. It seems to blow when accellerating from a dead stop. Seems like a bare wire or dead short would be the problem as it will run on a 5 amp fuse (5 amp used to get us home - normally run a 20 amp). I have checked most of the wiring I can find and all seems ok. Anyone had this problem?