Today, a FEBI BILSTEIN brand Pump, fuel pre-supply can be seen in automotive design, despite the development of electronics, as well as the fuel injection system, which is regularly improved. This handy device is used quite often. In the fuel systems of the engine, it is used everywhere. Most classic passenger cars have a high-pressure fuel pump as well as a low pressure fuel pump. In addition to them, a fuel pre-supply pump is also provided. The task of the device is to fill the cavities of the high-pressure fuel pump in order to ensure a stable supply of fuel after a long vehicle downtime.

1. 5 (E34)
2. 5 Saloon (E34)
3. 5 Touring (E34)
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The operation of the fuel pre-supply pump

Lifting the pump handle up creates a vacuum that opens the suction valve. As a result, the fuel rushes directly into the space under the piston. When the piston reverses down, the fuel pressure rises. Pressure penetrates the fine filter. If starting the engine is difficult, it is advisable for the driver to make sure that there is fuel in the tank of the car. This can be checked when a manual priming pump is installed in the corresponding power system. By resistance, the latter determine the presence of fuel directly in the line when the fine filter valve is open.