Ok heres the deal, weve got this jimmy 2.5 liter and it was runing ok. Tuned it up and it ran better. test driving it the other night it died. GOt spark but it keeps blowing the 10 amp crank fuse and get NO fuel. Anyone have a suggestion. We need this thing to run. Thanks in advance

Hi oldgabe, I don't know weather this will help or not but I just fixed my 88 4.3 jimmy with a fuel problem like yours. I found that the fuse block was shorting out on the back side. I removed it and cleaned all the terminals and installed all new fuses and the problem went away.
just my 2cents worth , good luck