I had the pump out about 2 weeks ago and I looked over all the Connectors/wiring etc but it all looked good.

Today when I got home I aimed my Infra Red Temp gun at the Control module I was getting 50 Degrees!? at first but it then cooled quickly.

I see theres a black earth wire on the harness plug that you plug into the Fuel Pump control module BUT where exactly does that actually earth out!?. I mean where does that black wire trace up to?....the ECU?