Fig. 10.1. Fuel tank: 1 – fuel level sensor with a fuel pump installed in the fuel tank; 2 – fuel tank ventilation hose; 3 – overflow device; 4 – filler neck
The fuel tank in the Fiesta meets high requirements, since in the event of an accident it must remain undamaged, and its contents must not spill out. Therefore, the tank is located in the safest place - at the rear of the car under the body. In all models, its capacity is 42 liters. The fuel level sensor (fuel reserve indicator) and the fuel pump installed in the fuel tank on cars with gasoline engines are a single assembly unit (Fig. 10.1). The fuel pump on Fiestas with diesel engines is located in the fuel pump, fixed to the cylinder block. In all models, the fuel supply and return lines are fixed on top of the sensor cover. The fuel tank does not have a drain hole. Therefore, before carrying out work on the fuel tank, the contents of the tank are pumped out with a hand pump through the filler neck.
Fuel tank ventilation
In the Fiesta, an electric fuel pump delivers fuel through a system of fuel lines from the fuel tank to the engine. A fuel filter is installed in the fuel supply line, which cleans the fuel from dirt and moisture condensation present in the fuel tank. In all Fiestas, the fuel filter is located under the body near the right rear wheel. In cars with diesel engines, the filter is located in the engine compartment, on the side of the engine block.
Fuel tank ventilation is important for the perfect fuel supply. As fuel is consumed, the same amount of air must enter the fuel tank, otherwise a vacuum will form in the tank and the fuel will be supplied intermittently. Tank ventilation is also important when the fuel expands when it is heated; when filling with fuel, air must freely exit the tank so that the fuel being poured in is not pushed out of the filler neck by the displaced air. The fuel tank ventilation hoses exit into the filler neck of the fuel tank. For environmental reasons, the fuel tank ventilation hose is not directly connected to the atmosphere, but is connected to a tank with activated carbon (absorber). The absorber is designed to capture the environmentally harmful fuel vapors that are constantly formed due to the heating of the fuel in the tank and exit through this hose. When the engine is running under a certain load, the fuel vapors are sucked out of the absorber. This process is controlled by an air solenoid valve in accordance with commands from the electronic ignition and injection control unit.
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