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DO NOT CHANGE THE WIRES AROUND! The fuel pump will run in reverse or not well depending on what which wires you switch around (there is 3, ground, resistance wire for the float and a hot or positive lead), i actualy tried this lol. Just clip it in. 2 things can happen:

 

A) Truck runs fine

 

B) Truck runs BUT yout fuel gage will be in reverse! (E=FUll Full=Empty)

 

You can fix B by pulling your float off your originol set up and swaping. You can avoid all the problems if you compare units before installing.

 

I'll take some pictures of the fuel unit tonight so you will understand where each wire is going (its the same for all 4.0l mj's).

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