My Jimmy keeps blowing the ECM BATT fuse, WTF is wrong? I need this thing running as it is my Daily Driver. Help!

 

This fuse powers the fuel pump relay, the fuel pump oil pressure switch, and the ECM itself. You can try unplugging or removing (in the case of the fuel pump relay) all of them and installing a new fuse, then turning the key on to energize the circuit. If it blows, then the problem is in the wiring itself. If it is good, then plug them back in one at a time and turn the key on. If you go through all of them and the fuse still does not blow, then it may be a combination of things.

Here is the schematic for the fuel pump:

The only thing it does not show is the connection to the ECM, but that is the only other thing that is powered off of this fuse.