2000 chevy g20 express van, ecm1 fuse blowing

You have a short to ground on one of these circuit's - ignition control module , ignition coil , crankshaft position sensor , VCM - vehicle control module , fuel injectors , camshaft position sensor . The fuse supply's B+ to all of these . Disconnect one at a time till fuse no longer blows . You can check this out for yourself here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size. Under systen click on electrical distribution ,then under subsystem click fuse panel . Click the search button then the second blue link . Scroll down to fuse discription .