Fuel Supply Overview
As with current gasoline fuel injection systems, there is an electric fuel pump located in the fuel tank. The fuel pump supplies the needed low pressure fuel to feed the mechanical high-pressure pump.
Scheme 289
| Index | Explanation |
|---|---|
| 1 | Fuel filler neck |
| 2 | Left hand service opening |
| 3 | Fuel return line |
| 4 | Fuel filter with heating system |
| 5 | Right hand service opening |
| 6 | Filler vent |
| 7 | Electric fuel pump module (EKP) |
INDEX EXPLANATION CHART
The fuel tank is equipped with two chambers and, on modern vehicles, is made from plastic. The electric fuel pump on the diesel engines is driven by the EKP module.
Similar to BMW gasoline engines, the fuel system on the vehicles equipped with diesel engines share much of the same "low pressure" system components.
However, there are some distinct differences with the diesel engine.
These are
- The system includes a fuel return line
- The breather system is significantly simpler
- There is no carbon canister (AKF) and no fuel tank leakage diagnosis module (DMTL)
- There is no pressure regulator
- The fuel filter is not located in the fuel tank.
The design layout of the fuel supply systems in the E70 and E90 are described in the following.