I have a 1989 chevy s10 blazer. Its a 2 wheel drive with a 4.3l V6. I tested the wires at the pump and no power. The ecmb fuse was blown, i changed it and baught a new fuel pump relay and changed it, i also changed the oil preassure sensor and still no power to the pump. Can anybody help me figure out what the problem is? I appreciate any and all help i recieve. Thanks