Why is there pressure in my diesel tank?
Why is there pressure in my diesel tank? Normal pressure in a fuel tank is kept stable through the evaporative emission control system (EVAP) system. The most common points of failure are a kinked fuel vapor line, a clogged EVAP canister or a failure in the purge control or vent solenoid. How does a diesel fuel tank vent work? In this fuel tank vent system, the vent allows excess pressure and vacuum buildup in the tank to escape through a narrow tube (shown above on the far side of the tank) that discharges near the ground. Fuel tank vent systems...