Power supply system (Audi 100 C3)

The fuel system of a carburetor engine consists of a fuel tank, fuel pump, carburetor, air filter and fuel lines. Carburetors can be installed single- or dual-chamber. The fuel pump is mechanically driven from the intermediate shaft on four-cylinder engines or from the camshaft on five-cylinder engines. The fuel pump is non-disassemblable and cannot be repaired. The air filter with a 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 K-Jetronic or KE-Jetronic fuel injection system from Bosch; some models have a turbocharger. The electrically driven fuel pump is located in the fuel tank. Fuel is continuously sprayed by the injector into the intake manifold, where it mixes with air and is supplied to the cylinder when the intake valve opens. The fuel system of a diesel engine includes a fuel tank, a high-pressure fuel pump, injectors, fuel and air filters, and fuel lines. In a diesel engine, fuel is injected directly into the cylinders by injectors at the end of the compression stroke. The required pressure is created by the high-pressure fuel pump.