The Audi S4 Fuel Pump Assembly has a fuel pump and its associated components that are needed for pumping fuel to the engine at the right time intervals. Older automobiles were equipped with mechanical pumps while the newer automobiles feature electrical pumps. The mechanical pump includes a diaphragm, intake valve and outtake valve. The electrical pump has three modules: the floating assembly, sending unit and the pump. The floating assembly includes a bulb which can be moved up and down to remain in contact with the fuel level. Based on the position of this bulb, the sending unit transmits an electric signal to notify the driver of the fuel level. The fuel pump is usually a 12-volt electric pump. It has a screen at its bottom to prevent impurities in the fuel tank from entering the pump. Some of the common symptoms of a bad fuel pump include engine misfire and rough idling.

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