The Volkswagen GTI Fuel Pump forces the gasoline located in the tank to the engine, and the sporty hatch exhales fire when required. The first Volkswagen hot hatches, which operated on carburetors, operated a camshaft-driven mechanical pump, which was mounted on the block and its lever acted on an eccentric to force fuel into the block and deliver between six and fifteen psi, sufficient to maintain the carburetor float bowl at full capacity. When Volkswagen changed the GTI to fuel injection, the model adopted an in-tank electric Fuel Pump that rotates each time the ignition command reaches its relay and bathes in fuel to cool even as it directs pressurized flow of about forty to sixty psi to the injectors. The two versions are similar in the duty of transferring fuel but are in different locations, pressure capabilities, and actuation methods. The mechanical type is located outside the tank and pushes a diaphragm each rotation initiated by the crankshaft; the electric version is located in the tank and is powered by a small motor and is checked by the ECU when an accident or low oil pressure occurs. To determine the gallons per hour rating that an appropriate Fuel Pump should be capable of sustaining, Volkswagen performance fans who aim to reach higher horsepower can determine flow requirements by multiplying projected horsepower by 0.5 in naturally-aspirated engines, or 0.75 in boosted engines, and then divide the result by 6.2.
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