Pressure/Vacuum Relief Fuel Cap

WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.

This system consists of a sealed filler cap with an integral pressure/vacuum relief valve. Fuel system vacuum relief is provided after one in. Hg. Pressure relief is provided after 1.8 psi (.13 kg/cm² ). Under normal conditions, filler cap allows air to enter fuel tank as fuel is used, without allowing fuel vapors to escape.