Puzzleing

[ChevCherry]

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???

[jveik]

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