1 Fuel line to fuel tank
2 Overflow (when filling)
3 Fuel filler connection
4 Fuel additive tank
5 Fuel additive pump unit
6 Vent assembly
The fuel additive tank is located behind the fuel tank and is attached to the crossmember. The fuel additive tank forms a unit together with the fuel additive pump unit and can therefore only be replaced as a whole. The fuel additive tank has a capacity of 1.8 liters for an average total mileage of 60,000 km. Therefore, the fuel additive has to be topped up according to the service specifications.
Note: The fuel additive tank cannot be emptied fully. Once the quantity remaining falls below 0.3 liters, fuel additive injection ceases (the driver is informed before this occurs via the relevant warning lamps). The residual quantity prevents the fuel additive pump from drawing in air, which could result in incorrect quantities of fuel additive being metered. The maximum top-up quantity is therefore 1.5 liters.