I was working on my friends 91 Isuzu pick-up with a v6 in it. The fuel pump
quit working and I thought it was a bad pump, but hot wiring the pump and
the pump runs and the truck will continue to stay running. We lost the
12v going back to the pump. The fuse and relays appear to be okay. The
check engine light is on when the key is on and there are no codes stored.
Is there something with the check engine light and the power to the pump.
Manual was terrible as we were using the Trooper schematic. Thanks, Dave