Monday, March 24, 2008
No power at fuel pump
Question: I replaced fuel pump on 01 Chevy s-10 4.3 checked relay and fuses still get no power, have any idea how to fix this ? Answer: Lets start withe the "ECM B" Fuse (the most common cause) It is in the under hood fuse block, it is a 20 amp fuse. Make certain the fuse is good and have battery voltage on both side with the key on. If the fuse is OK, move to the next step. Now you need to see battery voltage at the orge wire of the relay and at the dark green/ whte wire. and you should see ground at the blk wire. When you turn the key on you should also see battery voltage at the gray wire ... if you do not, the relay is bad. If you do, then you need to check for power at the fuel pump.. if you do not have power at the pump on the gray wire still, then you will need to repair the wiring/ replace the wire. Make sure you have a good ground on the black wire coming from the pump. That is all there is to the circuit. If you do not see power to the drk green wire, you need to check the plug at the ecm( computer ) if it is OK along with the wire, you will need to replace the computer.