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How a fuel delivery module is designed and works

Pierburg | Motorservice

How does a fuel delivery module work? What components is it made up of? What do we mean when we talk about a regulated fuel supply? What is a pulse width modulation signal and what is it used for? This video gives you the answers.

0:20 – 1:45
Fuel delivery modules are located in the fuel tank. They consist of the flange cover, the fuel pump in the reservoir (swirl pot) and other attachments such as the sender unit, filter, non-return valve, supply line to the engine, return side, suction jet pump or pressure regulator.

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2:19 – 2:45 Demand-based fuel supply
Control units for fuel pumps are used in both “regulated” and “demand-based” fuel supply systems. They control fuel pumps using a pulse width modulation signal (PWM signal). This means that, in contrast to unregulated fuel supply, only the required amount of fuel is supplied. This reduces the power consumption and saves fuel.

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