Vicious Beaner!

ok guys so i have a 1997 ka auto 240sx. Mostly stock except for a header / and a walbro 255 fuel pump. it just started doing this recently but everytime im on the highway or somewhat long drives it keeps blowing the 7.5 EGI FUSE!! Then car loses power and cranks but wont turn over till i put in a new fuse and starts right back up. Few days go by and same problem it blows it . Ive tried putting a 10 and 20 fuse but that wont even make it turn over it just blws it. Till i put back in the 7.5 . Idk what can be causing this issue, but its getting really annoing pulling over the highway every couple of days to put a new fuse. My driverside harness is tucked since my car has big wheels, but doesnt seem to be chewing it up or anything. Hopefully you guys can me some ideas. Thanks in advanced!

-Eric