1984-1985 Ford Bronco II 2.8L V6 GAS;. 1985 Ford Bronco II 2.3L L4 DIESEL;. 1986-1988 Ford Bronco II 2.9L V6 GAS;. OE Equivalent Fuel Tank Cap;. Fuel Tank Cap;. Gates - Driven By Possibility. Two-way action pressure relief/vacuum relief valve allows fuel tank to ?.