Fuel Supply Systems

The fuel pump is part of a fuel supply unit which is located in the tank.

The fuel supply unit consists of a fuel pump (sometimes with swirl pot), a filter, and a flange with corresponding connections. In addition, the supply unit can be equipped with a lever-type sensor, or can be used with a tubular-type sensor.

Lever-type sensors are used to measure the fuel level in connection with an electrical display unit. Some sensors are grounded. Sensors without grounding have a separate ground connection.

The lever-type sensor types in the product range include:

• Without warning contact, insulated return
• Without warning contact, insulated return (adjustable)
• Without warning contact, insulated return (special)
• Lever-type sensors can also be equipped with a warning contact to signal the reaching of a fuel level limit (reserve) and for continual measuring.

Tubular-type sensors are used to measure the fuel level in connection with an electrical display unit. Some sensors are grounded. Sensors without grounding have a separate ground connection.

The tubular-type sensor types in the product range include:

• Without warning contact, common ground or insulated return (ø 54 mm)
• Without warning contact, common ground or insulated return (ø 80 mm)
• With warning contact, common ground or insulated return (ø 54 mm)
• Without warning contact, common ground or insulated return (special)

Tubular-type sensors can also be equipped with a warning contact to signal the reaching of a fuel level limit (reserve) and for continual measuring.

Fuel pressure regulators maintain a defined fuel pressure. If pressure is exceeded, a spring-loaded membrane allows the return-flow channel to open, permitting excess fuel to flow back into the fuel tank.

Within a supply unit, a pump is installed into a swirl pot.

The exact quantity of fuel is determined for every engine operating state. The injection valve injects the calculated quantity exactly dosed at the prescribed time in front of the cylinder input valve and thus ensures clean and efficient fuel utilization.