Pic. 10.1. Fuel tank: 1 - fuel level sensor with a fuel pump installed in the fuel tank; 2 – a hose of ventilation of a fuel tank; 3 - overflow device; 4 - filler neck
The fuel tank in the Fiesta fulfills high requirements, as in the event of an accident it must remain intact and its contents must not spill out. Therefore, the tank is located in the safest place - in the rear of the car under the bottom of the body. In all models, its capacity is 42 liters. Fuel level sensor (fuel reserve gauge) and the fuel pump installed in the fuel tank on vehicles with gasoline engines are one assembly unit (pic. 10.1). The fuel priming pump on Fiesta vehicles with diesel engines is located in the fuel pump mounted on the cylinder block. In all models, the fuel supply and return lines are mounted 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 fuel line system from the fuel tank to the engine. A fuel filter is installed in the fuel supply line, which cleans the fuel from contaminants and moisture condensate present in the fuel tank. In all Fiesta vehicles, the fuel filter is located under the underbody near the right rear wheel. In vehicles with diesel engines, the filter is located in the engine compartment, on the side of the engine block.
Ventilation of the fuel tank is essential for a 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 fuel will be supplied intermittently. Tank ventilation is also important when the fuel expands when it is heated; when refueling, the air must freely exit the tank so that the fuel being poured is not pushed out by the displaced air from the tank filler neck. The fuel tank vent hoses lead to the fuel tank filler neck. For environmental reasons, the fuel tank vent hose is not connected directly to the atmosphere, but is connected to the activated charcoal tank (absorber). The absorber is designed to trap environmentally harmful fuel vapors escaping through this hose, which are constantly formed due to heating of the fuel in the tank. When the engine is running at a certain load, fuel vapors are sucked out of the absorber. This process is controlled by an air solenoid valve according to the commands of the electronic ignition and injection control unit.
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