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I've searched, I've googled for hours.
Doing an external fuel pump on my 2003 2500, every wiring diagram I've found is incorrect, possibly because I believe 03 was a retrofit in-tank correct?

Basically I have a 4 pin connector. Right to left would be 1-4. My best guessing is #1 is pump 12v switched on, 2 and 3 are sender related, and #4 is the ground. If anyone has a diagram or first hand knowledge would be great.

I'm planning on running the ground also to the aftermarket pump, is it necessary, as in a relay controlling ground side for any reason or just power side?


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