Hello, the OEM Fuel pump part number is 15050590, and GM has always used the Grey wire as the power feed for the fuel pump. The black wire is Ground. The purple wire is the fuel level sensor signal and the Low Reference (Ground) for that is the black/white wire. You may want to get the correct pump, are those wire colors you mentioned on your truck or the new pump?
Here's the wiring diagram for the fuel pump and its connector, as well as the part number.
Images (Click to make bigger)
SPONSORED LINKS
Monday, December 11th, 2023 AT 11:34 AM