Fuel Pump Components

Fuel Pump







1. Pump with an integrated PRV safety valve (Pressure Relief Valve)
2. PVV (Pressure Ventilation Valve)
3. Fuel level sensor
4. Fuel filter
5. Non-return valve
6. Ejector pump.

A fuel pump (FP) with a flow which is adjusted to suit the requirements. By controlling the power consumption of the pump based on the fuel requirement of the engine, the following is achieved:
- long service life (all components in the system must last 150 000 miles/15 years)
- tailored power consumption.

A DC motor drives a pump which works on the turbine principle.

Pump flow is as follows at:
- full load approximately 90 liters per hour at 400 kPa (corresponding to 380 kPa at the fuel rail)
- idle speed approximately 1.2 to 2.0 liters per hour.

The power consumption varies from approximately 8 A at full capacity to approximately 2 A at idle speed.

Valves

PVV (Pressure Ventilation Valve)
The valve compensates for surges in pressure that occur when, for example, fuel injection ceases during engine braking. Allowing fuel to continually pass through the valve ensures rapid pressure compensation. Any excess fuel flows into the pump housing.

The pressure is limited to 400 kPa (corresponds to 380 kPa at the fuel rail).

When the engine is switched off, the valve maintains a residual pressure in the fuel injection system to prevent condensation.

Non-return Valve
Releases fuel into the pump housing when the fuel tank is refilled having been almost empty. The valve is closed if the car tilts so that fuel remains in the pump housing.

PRV (Pressure Relief Valve)
Safety valve integrated in the fuel pump (FP). The valve opens between 550 kPa - 850 kPa.

Ejector
Continuously fills the pump housing with fuel. Approximately 10 - 15 liters per hour always flows from the fuel pump (FP) through the ejector and back to the pump housing.

Fuel Filter
The fuel filter is in the pump housing. Cannot be replaced.