If you ever find yourself having to pull your fuel pump assembly for anything what-so-ever, definitely replace all of the cover and assembly screws with bolts. It will save you a lot of hassle down the road. I remember finding a thread that suggested doing it, but I cannot remember where. They are M4 sized bolts, I can't remember length. I also used a flat and lock washer, which made it the same length as the screws coming out.