Models with a carburetor engine are equipped with Solex, Zenith or Pierburg carburetors (depending on the engine displacement and its power); the type of carburetor is determined by the markings cast on the side of its body.
Fuel pump - mechanical type, depending on the engine type is mounted on the cylinder block or cylinder head. The fuel tank is located in the rear of the car under the rear seat, the filler cap is in the right rear wing. Fuel tank ventilation - external.
The system includes a return fuel line connected to a tee between the carburetor and the fuel pump or directly to the carburetor float chamber. The return fuel flow is regulated by a restrictor installed in the return fuel line. An in-line fuel filter is built into the fuel supply line to the fuel pump, its replacement is described in Chapter "Car maintenance work". Sometimes an additional fuel filter is installed in the fuel line from the pump to the carburetor, which is designed to trap particles that entered the system during vehicle assembly. If the additional filter becomes clogged, it should be replaced with a piece of hose of the appropriate length.
On injection engines, instead of a carburetor, a Bosch K-Jetronic fuel injection system is installed, the fuel pump in this case is located at the rear of the car, next to the fuel tank. The pump has an electric drive. The fuel injection system parts are shown in drawing W:34 and drawing W:36 The carburetor/fuel injection system is the most complex unit, on which the economy and efficiency of the engine depend. All parts of these systems are calibrated with high precision, in accordance with the requirements of a specific engine. The carburetor adjusting screws are covered with limiting caps, plugs or paint to prevent unqualified intervention. Make the adjustments described in this chapter only in extreme cases; leave any additional work to specialists.
Most carburetors come with repair kits that contain all the necessary replacement parts. Remember that if the carburetor has been in use for a long time, then as a rule, the most economical solution will be to install a new unit.
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Before starting any work on the fuel system, disconnect the ground wire from the battery. Safety precautions when working on the fuel system are described in Chapter "Basic rules for carrying out work". Fuel system components must be kept clean, thoroughly clean the surrounding area before disconnecting fuel lines. Always install new gaskets, seals, hoses, clamps, clips, etc. whenever possible.
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