Fuel supply systems, diesel engines
WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.
Fuel system
The electric fuel pump in the fuel tank supplies the engine with fuel. Two types of high-pressure pump are used for cylinder injection.
- The distributor injection pump supplies each cylinder directly with fuel via the corresponding injection nozzle.
- The high-pressure pump for the common rail systems generates in the fuel rail the necessary pressure for all the injection nozzles.
In common rail systems, a further pump (inline pump, M57/gear pump, M67) is connected between the high-pressure pump and the electric fuel pump. This pump supports the fuel pump in the fuel tank in the event of a high fuel demand.
Tank venting system
Diesel fuel is non-volatile and therefore a carbon canister is not required. The fuel tank is vented directly to atmosphere.