Puzzleing

I have a 1987 Chev half ton with a 4.3L v6 with TBI. The fuel pump quit on me one day, so to see if it still wokred I wired it direct. The pump did come on however the injecters wernt squirting fuel. I quickly dicovered the ECM fuse was blown, once I changed it ONLY ONE injecter started squirting, so then I put the fuel pump wireing back to the way it was supposed to be and both injecter started squirtinf agin and everything worked fine for a few days???????

Then the fuel pump quit again, I started by checking the ECM fuse, which was the problem last time, but it was not blown, instead I discovered that the ECM-B fuse was blown. I replaced it but as soon as I turned the key the fuse blew. So i knew something was grounding or drawing too much current. Just for shits and giggle i changed the fuel pump back to directly wired and not only did the ECM-B fuse NOT blow but the truck ran fine........ however before when the pump was wired direct, only one injecter would work.. I cant figure out this contradiction.

What would cause a ECM fuse to blow, and what would cause a ECM-B fuse to blow, if I wired a ampmeter in serios with the fuwl pump when the truck is running what should the pump draw for current???

the stereo thats spliced in would cause it lol. maybe just try a bigger fuse. thats what i did for my high fan blower setting. dont go too high above what u were using before tho lol or if u do get a surge, whatever is getting power will fry like an egg on a sidewalk in july