Jay-west

Someone help before I go insane! my sti started juddering and spluttering like mad a few days ago, I came onto here and sumone said it may be the coilpacks. It went into garage and onto diagnostic system and nothing came up but they found a fault, and it was that the fuel pump had gone and it wudnt start!!!!!!! so towed it back home today (as it wudnt run) and I've been told it could be an electrical fault from the fact that my amp fuse keeps blowing!!!! can electrics do this to a car?
Also subaru mechanics told me the pump is in the boot in the spare wheel well but upto now im 99% sure it's not in there! Where is it? thanks jay