Hello guys

I have a 1996 blazer, with a 4.3 in it. I was driving it to work, and it all of a sudden just shut off, i looked at the fuses and ECM BATT fuse blew. I put another 20A fuse in there, and it blew. I put a 30A fuse in there, and it started. I let it run for a few minutes, put it in drive, went to give it gas and it blew.

I've replaced the MAP Sensor, I've changed fuel pumps, I looked on the passenger side beside the exhaust manifold and there are no melted wires.

I'm at a loss here guys. I need some help.

 

I'm prob too old school in my thinking to help you much but I'd start by looking for frayed insulation on wiring that could be grounding out. Under hood, dash ECT.
However NEVER increase fuse amp rating over the original even by 10 amps in-less you enjoy smoke and melted wires and or fire.