TJ Fuel Pump Harness Wiring on '06 Wrangler - jeepforum Aug 28, 2012Hey, I have an issue trying to figure out exactly what the color coding is for the 4 wire type wiring harness that attaches to the fuel tank on a 2006 Wrangler Rubicon. According to the service manual I'm using for reference it should be this: 1. Dark/Green - White = Fuel Pump Relay Output 2. Dark/Blue - Light Green = Fuel Level Sensor Signal 3.Author: Bruinjeeperfuel pump/wiring harness - JeepForumJun 29, 2018Replace Engine Wiring Harness - JeepForumJun 15, 2014Fuel pump wiring diagram/help - JeepForumJul 06, 2012Fuel Pump Wire Pigtail - JeepForumSep 20, 2010See more results Fuel pump.. which wire is which? - Jeep Wrangler Forum Jul 13, 2012I did this when I thought it was the fuel pump. There are 3 wires that go to my fuel pump, +, - and the center which is the sending unit. What I did was unlug the harness take a 12v power source (battery charger) 2 small wires 1+ and 1- stick them into the outside 2 sockets of the harness(the center doesn't matter because it is the sending unit).