Fuel Gauge Sender - RA4700HFM0010X(47-0010)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

A. Model 124

Fig 1: Function Of Fuel Gauge Sender Components (Model 124)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

As the fuel level drops, the variable resistance is increased by the float (2) moving down, as a result of which the voltage drops and the needle in the instrument cluster moves back.

If the fuel level drops to the reserve quantity, the reserve warning contact (5) closes and switches ground to the reserve warning lamp, as a result of which the lamp comes on when the engine is running.

The reserve warning lamp comes on when the ignition is switched on (check function). It goes out as soon as the engine is running provided the fuel tank contains more than the reserve quantity.

B. Models 129, 140

NOTE: The reserve warning lamp comes on with a weak light for the check function, and with a brighter light to indicate reserve quantity.

Fig 2: Function Of Fuel Gauge Sender Components (Model 129, 140)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on engine 129

As the fuel level drops, the variable resistance is increased by the float (2) moving down, as a result of which the voltage drops and the needle in the instrument cluster moves back.

If the fuel level drops to the reserve quantity, the reserve warning lamp is switched on by the electronics in the gauge. As the reserve quantity decreases, the needle moves in the reserve display panel toward the end stop (dynamic display).

The reserve warning lamp comes on when the ignition is switched on (check function). The lamp goes out as soon as the engine is running provided the fuel tank contains more than the reserve quantity.

C. Model 202

NOTE: The reserve warning lamp comes on with a weak light for check function, and with a brighter light to indicate reserve quantity.

The sender (B4/1) is a lever sender with wiper contact. A sender is installed in each chamber of the fuel tank.

Fig 3: Identifying Outlet Valve, Left Closing Plate And Fuel Gauge Sender

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.