D4F or F4R or K4J or K4M
Operating diagram of the petrol supply circuit ( " pump - sender - fuel filter " assembly).

The fuel system does not have a return.
The fuel pressure does not vary with engine load.
The circuit comprises:
Petrol supply circuit: Operating diagram
M4R
Operating diagram of the petrol supply circuit

The fuel supply circuit does not have a return.
The fuel pressure does not vary with engine load.
The circuit comprises:
Diesel supply circuit: Operating diagram
Diesel filter: Removal - Refitting
Injector rail - Injectors: Removal - Refitting
Driving
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