Evaporative Emissions System: Maintenance

The fuel evaporation system is maintenance free, but hose connections and fuel cap should be checked every 15, 000 miles.

Fig 1: 528i and 633CSi Fuel Evaporation System

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: 733i Fuel Evaporation System

Courtesy of BMW OF NORTH AMERICA, INC.