Ecmb fuse blows 87 /88 s/10 blazer?

87 s10 blazer has fuse that blows as soon as you replace it the fuse is for the ecmb when that happen there is no in jectior pulse i know to ck for grounds there has ben some cecer replce and a fuel pump don t see any broken or piched wire that ican i have tested i also don t know where the wires go for the fuel pump it looks like they go in side the back othe body not sure the blazer i did have running for ahalf hour and turn it of did not start it does startwhen cold and change the fuse when cold ihave changed the cencers and the com still has the same problem need help thanks