The power supply system of a carburetor engine consists of a fuel tank, a fuel pump, a carburetor, an air filter and fuel lines. Carburettors can be installed single and double chamber. The fuel pump is mechanically driven by an intermediate shaft on four-cylinder engines or from a camshaft on five-cylinder engines. The fuel pump is non-separable and cannot be repaired. The air filter with dry replaceable paper element is equipped with an automatic device for adjusting the temperature of the air supplied to the engine. Most Audi engines are equipped with a fuel injection system. This system consists of a fuel tank, a submersible fuel pump and the Bosch K-Jetronic or KE-Jetronic fuel injection system itself, on some models a supercharger turbocharger is installed. The electrically driven fuel pump is located in the fuel tank. Fuel is continuously sprayed by the nozzle into the intake pipe, where it mixes with air and is fed into the cylinder when the intake valve opens. The diesel engine fuel system includes the fuel tank, high pressure fuel pump, injectors, fuel and air filters, and fuel lines. In a diesel engine, fuel is injected by injectors directly into the cylinders at the end of the compression stroke. The required pressure is generated by the high pressure fuel pump.
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