Okay, there's your problem. The ground wire or the ground connection to the frame is bad. You should have no more than 0.1 volts in any segment of the circuit. The goal of any circuit is to dump all available voltage across the load, which in this circuit is the fuel pump, but because of corrosion, broken wire, bad connector, you are dumping 3.21 volts across the ground wire because of the resistance in this segment of the circuit. Replace the connector a new one and run a new ground wire and make sure the connection to the frame is clean, tight, and metal to metal and you should be back on the road worry free.
Sunday, April 14th, 2019 AT 8:59 AM