Trying to make a 2003 Silverado 6.0 OEM fuel pump work on a motor swap/transplant. There are 2 connectors: 1 is a 3 pin connector with wire colors: GRAY-GREEN-BLACK....the other connector is a 4 pin connector: Orange/Black-GRAY-Black-Purple.
Don't want to burn the pump up. I just need to know which is power & ground...

TIA

 

Does this help any?

 

The connectors and pump dont look like that, Damn it might be a newer pump...

 

Gray and large Black are the fuel pump wires. Gray is power. Purple and Orange are for the fuel sending unit. The 3 way connector is for the in tank pressure sensor.

 

Nothing happens when I connect 12V power to gray wire....
When I connect 12V power to gray & orange wire pump sounds like's it's on...

 

I tried every combination & 12 volt power to Gray & Orange wire's sounds like pump is on or shorting out...

 

What application is the pump for?

 

I just found out that the fuel pump is from a 2004 Silverado 6.0 ...
I'm doing a conversion. 2004 Silverado rolling chassis with a 1985 Silverado body

 

Haven't been able to find out where Orange wire goes....

 

Pull the pump out and trace the wires.