I just did a master cylinder replacement, finished it, then the truck would not start. What the heck? If I turn on the key, I get no fuel pumps running. If I remove the relay, and jumper the two big wires together, the fuel pump runs and so does the truck! So I was sure it was the relay. I put in a new relay, and I still have no pumps running. If I remove the relay and jumper those two again, It will run with 42 psi on the fuel rail. The previous owner had both fuel tanks replaced, but only the front tank pump replaced a few years ago. He told me the rear tank pump has not worked in years, only run the front tank. Why would I suddenly loose all fuel pumps? ANY IDEAS are greatly appreciated!!
