SLK 320 (170.465) V6-3.2L (112.947) (2002)
Fuel Filter: Description and Operation
Fuel Filter With Integrated Fuel Pressure Regulator, Function
Fuel Filter With Integrated Fuel Pressure Regulator, Function
55/1
Fuel filter with integrated fuel pressure regulator
55/3
Valve
55/5
Membrane
55/6
Push spring
55/9
Filter insert
55/40
Diaphragm pressure regulator
A
Feed from fuel pump
b
Vent line
B
Return flow to fuel tank
C
Fuel to engine
The fuel filter consists of a sheet metal casing with an integrated filter element (55/9). The fuel flows through this from the outside to the inside. As a
result any impurities are trapped.
The diaphragm pressure regulator (55/40) controls the fuel pressure of approx. 3.8 bar (operating pessure) via the fuel return flow quantity to the fuel
tank.
If the set fuel pressure is exceeded, the diaphragm (55/5) is pushed against the push spring (55/6) and the valve (55/3) attached to the diaphragm opens
the passage for the fuel return to the fuel tank (B).
If the set pressure is below the limit, the valve is closed again by means of the push spring.
Fuel pressure as a function of the fuel pump delivery