Fuel tank - component description - GF47.10-P-2000VB

MODEL 211 with ENGINE 272.922

MODEL 211, 219 with ENGINE 272.943

MODEL 211 with ENGINE 272.944

MODEL 221 with ENGINE 272.946 up to Model Year 8

MODEL 203 with ENGINE 272.960 up to Model Year 8

MODEL 211, 219 with ENGINE 272.964

MODEL 221 with ENGINE 272.965 up to Model Year 8

MODEL 203 with ENGINE 272.970 up to Model Year 8

MODEL 211 with ENGINE 272.972

MODEL 221 with ENGINE 272.975 up to Model Year 8

MODEL 221 with ENGINE 273.922 up to Model Year 8

MODEL 221 with ENGINE 273.924 up to Model Year 8

MODEL 211, 219 with ENGINE 273.960

MODEL 216, 221 with ENGINE 273.961 up to Model Year 8

MODEL 211 with ENGINE 273.962

MODEL 209 with ENGINE 273.967

MODEL 221 with ENGINE 273.968 up to Model Year 8

MODEL 209 with ENGINE 272.960

Fig 1: Identifying Fuel Tank Components

Courtesy of MERCEDES-BENZ USA

Shown on models 211, 219

Location

The fuel tank is positioned at the frame floor ahead of the rear axle because of the through-loading facility from trunk into passenger compartment.

Design

The fuel tank is made of sheet steel or two-layer plastic and is divided into two chambers due to the U-shaped recess clearance. The chambers are connected to each other.

Shows model 211

Fig 2: Fuel Pump Flow Design

Courtesy of MERCEDES-BENZ USA

Function

The fuel flows from the two-stage fuel pump into the fuel delivery module (88), out of the right fuel tank chamber, through the fuel pressure line (B) to the fuel filter with fuel pressure regulator (55/2) into the left fuel tank chamber.

A junction at the fuel filter with the fuel pressure line (D) supplies the suction jet pump (95). A suction effect is produced in the suction jet pump which draws the fuel from the deepest point out of the left fuel tank chamber to the fuel delivery module (C).

Moreover excess fuel flows from the fuel pressure regulator to the fuel delivery module (A).

This ensures that the left fuel tank chamber is properly emptied.

The filtered fuel with controlled fuel pressure is supplied to the engine via the fuel pressure line (92) (single-line system).

The housing of the fuel delivery module serves as a swirl pot. While cornering with a low level of fuel in the fuel tank, it prevents the fuel pump from drawing air.

A fuel strainer is installed at the bottom in the fuel delivery module at the feed to the fuel pump.

Each fuel tank chamber has a fuel level indicator sensor. The resistance values are transmitted separately to the rear SAM control unit with fuse and relay module, which processes the signals accordingly and transmits them to the instrument cluster over the CAN databus.

For maintenance and repair work, loosen the screw rings or the nuts at the top of the fuel tank only when the fuel tank is filled 2/3 to maximum capacity.

The fuel tank has no outlet valves. It is drained through the fuel pump via the fuel line in the engine compartment.