Fuel pump wiring for aftermarket GM fuel pumps

take it back ...save $$ go to advance will have color code for pump

I have seen this and took me a long time to figure it out. The problem I have found was inside the plug on the wiring harness to the fuel pump. You can't see it unless you take the plug apart and it may be corroded inside. I don't know if this is your problem but check to see if you have power there and wiggle the wiring to see if it cuts out. Hope this helps.

The problem is either your fuel pump relay is overheating our your fuel pump is over heating. They also have the problem with the wire connector on top of the fuel pump melts. This is a known problem with them, when you but a new fuel pump they give you a new connector and a service bullentin regarding this problem.

hi, if you bought a new fuel pump assembly you are one of many who had problems with the connectors. so your not alone. the fuel pump manufacturers changed the plug configuration to solve a problem with the existing plug, the plug being replaced is the square plug on the left. the new pump assembly came with the new pigtail and you need to cut off the connector(close to the plug so you have enough wire) and ****-connect the new plug onto the trucks wires. the wires will be color coded to match the old wires, they maybe dirty and oily so you will probably have to clean them to tell the difference. also the pump should come with a diagram to help solve the wire problem.

10psi is, as I'm sure you know, about 48psi short of what you need to get it running. Did you verify you're getting a full 12 volts at the fuel pump connector? Check the ground wire also, ohm it out to chassis ground, shouldn't be more then a few ohms. Verify it's making a good connection and the terminals are clean and tight. High resistance in the wiring or a connector in the circuit could cause the fuel pump to not output the right amount of pressure.
Did you replace the fuel pump with an aftermarket unit or an oem part?