new wire harness for fuel pump

If you get it mixed up the pump will run.in.reverse and wont work correctly.

How do you know what black from harness to hook up to what black on truck?

That's gm wiring the terminal A is gray that's the power feed to the pump then terminal C is black which is the ground to the fuel pump.

I see the letter designation for the different color wires on the old connector harness but there is no letter designation on the new harness connector to know which is the black ground wire?

Use the old one and match it up with new to tell which letter is which.That's all you have to do use it as color key as well that's what I would do.

The new connector on the left is a different shape than the old connector so I don't know how to match them up Because they don't line up the same.

Did the new connector come with instructions like how to wire it?

No it did not

Are the wires to the pump color coated?

Also what brand pump is it?

The wires are color coated on the harness and I ordered this pump online and can not find anywhere on the unit of what brand it is or on the packing list.

I was asking if the wires were color coated bellow the fuel pump module top where you could match the colors up?What is the part number of the pump?

The wires coming out the bottom of the module are two blue wires and a black and gray. I got the pump from am-autoparts.com and the part number is AM-64181140.

Is the black and the gray going to the fuel pump?You could jump the two black wires to a battery and see which way they pump fuel.You said one black wire is larger the other?My guess is the larger wire is the power wire.

Disregard what i just said i must getting too tired to answer questions.Look at the new connector you will see the black wire and gray wire right next to each other.Plug the new connector into the new fuel pump module then put power to the gray wire and ground to the black wire right next to it.Does the fuel pump run?If so those are the power and ground to the fuel pump.To find the ground from the wire harness for the fuel pump use your ohms meter to see which black wire is grounded that one goes to the ground side of the fuel pump.Iam headed to bed let me know what you find.

The two blue wires are going down to the float and the black and gray go to a connector and out of the other end of that connector they change color to a black and red and run down into the bottom of the module which i'm assuming is the pump your talking about. yes, one of the black wires does seem to be just a bit larger then the other one. I haven't installed the new pump yet and not sure what you mean by jumping the to black wires to a battery.

I'll let you know! thanks and get some sleep!

Alright keep me posted.