GF07.61-P-3004BK ME Fuel Supply, Function

GF07.61-P-3004BK ME Fuel Supply, Function







The fuel supply system must make available to the fuel injection valves an adequate quantity of filtered fuel from the fuel tank, and at an adequate pressure (injection pressure), in all operating conditions.

The fuel pump in the delivery module (88) draws the fuel out of the right chamber in the fuel tank (75) and pumps it through the fuel filter with integrated diaphragm pressure regulator (55/2) to the injectors connected to the rail (single-line system).

The fuel in the left chamber is pumped along a connecting line with a suction spray pump to the right chamber.

The pressure regulator regulates the fuel pressure to approx. 3.8 bar. The fuel pressure is regulated independently of the intake manifold pressure.

The return line from the fuel pressure regulator supplies the suction jet pump for filling the swirl pot in the fuel tank.

The voltage supply for the fuel pump is performed via the fuel pump relay. The fuel injectors operated by the ME-SFI control unit, spray the finely atomized fuel into the inlet port.

If the fuel pressure is too low, combustion misfires can occur and can be retracted in the diagnostic trouble code memory. The cause can be, for example, a contaminated fuel filter. In these cases, check the fuel pump delivery rate at the feed to the fuel distributor rail.

Fuel vapors out of the fuel tank are intermediately stored in the activated charcoal canister (77) and, burnt in the engine via the purge control valve when purging is enabled.

(USA)
The activated charcoal canister shutoff valve and fuel tank pressure sensor are necessary for the checking the leaktightness of the purge system.