Hey all,

So I have had an EFI fuse continuously blow out every 2-3 miles recently. I was ALMOST home when it blew and I put a 25 amp fuse in it as a replacement to make it home. (It’s a 7.5 amp and I had spares but had ran out from constantly blowing them). After I started the car up, all the fuses were fine, cleared my engine codes and proceeded to peel out of the parking lot in hopes to make it home before it blew again. Well Halfway into pulling out and the car just died. ECU seems unresponsive and I had to get it towed. Now the car won’t start and it’s showing the same signs it did a week ago when I actually bricked the ecu from tuning it. I replaced it obviously but I’m not sure if I just bricked it again or fried it because of too many amps going through? I do have an aftermarket fuel pump so I’m wondering if that was causing the EFI #2 fuse to constantly blow or if it was just a ground somewhere. I have a 98MM turbo so obviously nothing is stock on the damn thing but I’m scared to buy another ecu and try to diag the fuse again? Or do I even need to buy a new ecu? Is it possible the fuse for the ecu communication blew? And if so where could I locate that fuse? I had trouble looking in the fuse panel for anything related to the ECU. Anything would help! Thanks for letting me share . (Yes I know putting a higher rated fuse is bad pls don’t hammer me for that I just wanted to get home).

Generally speaking, a fuse is designed to protect anything downstream from it from excessive current. Too much current can kill just about anything. If your circuit was protected with a 7.5 amp fuse (that was blowing) and you put a 25 amp fuse in, you very likely killed it.