The Volkswagen Golf Fuel Pump maintains the running of the engine by passing the correct amount of gasoline from the tank to the carburetor or, in later models, to the fuel injectors at the pressure that each system of the engine requires. Early carbureted models of Volkswagen had a camshaft-driven mechanical pump attached to the block whose lever draws fuel and creates approximately six to fifteen psi, which activates the float bowl's ideal pressure, cutting off when the float valve closes. This unit is cooled by air because its location is not inside the tank. With fuel injection becoming the norm, Volkswagen began using in-tank electric pumps that rotate at high speed, remain cool when submerged, and deliver forty to sixty psi or more, the pressure that a modern injector rail requires. The pump is assembled with a level sender and supplied with voltage by an electric assembly, which provides power only under safe conditions. Fuel Pump capacity is usually specified in gallons or liters per hour, and capacity selection is easy, multiply horsepower by 0.5 in a naturally aspirated engine or 0.75 in a boosted engine and then divide by 6.2. Contemporary Volkswagen control units can adjust the speed of pumps in order to reduce noise and extend lifespan. Subsequent generations of Golf can thus have a more steady fuel supply at the throttle body during wide-open throttle. In case of symptoms, pay attention to sound during operation, voltage, and the pressure and volume since a quiet or weak Fuel Pump makes the engine crank without success.
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