Fuel Gauge Inop but Sender OK - What Wiring & Interconnects to Check?

[cadman]

Hey Guys, 2012 1.4L Hatchback. Had an intermittent fuel gauge that finally went open circuit throwing P0463. Dropped the tank and it's not the sender. Digging further, I also have secondary DTCs regarding EVAP and Tank Pressure. Being all physically related to that area, I'm thinking this is a wiring issue somewhere between tank and ECU. I removed the rear wheel well splash shield and popped open the interconnect there, but all is clean and looks okay. No terminal push-backs.

Any ideas where I should check next? I'm no stranger to a multimeter, so if anyone has a link to a wiring or harness diagram, I'm all ears.

 

[cadman]

Here's a solution for anyone else that has this problem. The "low reference" wire [pin B BK/L-GN) in the fuel tank harness had corroded and broken free of the terminal in the connector that plugs into the body harness interface behind the passenger side rear wheel. After removing the harness and unwrapping it, I noticed the wires were wet, and there is a ground splice for this lead buried towards the tank breakout. I suspect capillary action may have drawn water up to the terminal where it corroded and broke off. The terminal seal was still 100% intact, and the copper strands were discolored when stripping back. Cleaned, soldered, wrapped and re-installed and everything is working.