Runnin Away

I keep blowing the 20 amp fuse for the fuel pump in the passenger compartment it occasionally happens but it doesn't always, normally when i replace it it fine, but today i replace it and it blew 2 fuses before it actually didn't blow again i dont know what it is at all. I was thinking maybe it could be something grounding out or a short or something but i ruled that i out because it just s tarted up with out me messing with any wires