How does the gas tank work in a GMC?
How does the gas tank work in a GMC? Quick google search says that onboard computer monitors the fuel level in both tanks and averages the fuel remaining to show on your gauge. The primary fuel pump is in the front tank. When the level in the front tank drops, it sends a signal via a fuel pump relay to trigger the rear fuel pump to send fuel to the front tank. Why does my gas gauge not work on my GMC Truck? Trucks of that "era" had a problem with the gauge cluster that would make the fuel gauge...