Fuel Gauge

Fuel gauge

General
The tank content is measured with two lever sensors which are separately linked to the instrument cluster electronics ( IKE ). Each lever sensor is connected with a separate ground (analog ground) and a sensor line (analog positive) to the instrument cluster electronics ( IKE ). There is no reserve contact in the level sending unit to activate the fuel reserve warning lamp. The fuel reserve warning lamp is switched on dependent on the tank contents in comparison with a reserve threshold value.

Tank
At present tank sizes with 85l and 95l capacity are installed in the 7 Series (E38). A 95l tank can be recognized by the fact that it extends lower than the floor assembly and a stone guard is installed. At present, only a 70l tank is installed in the 5 Series (E39). The different methods of determining the fuel level for the fuel gauge with the 85l/ 95l (E38) and 70l (E39) tank are adapted by means of the coding data.

If defined training of the left-hand or right-hand tank half is necessary for test purposes, particular care must be taken to ensure that the correct connection is used (on 7 Series E38 only). For both tank halves it is located on the left-hand half of the tank. On both drain connections, a reclined rectangle is stamped on the connection for the right-hand half of the tank and an upright rectangle is stamped on the connection for the left-hand half of the tank.

On the 5 Series (E39) it is not possible to drain off fuel via separate connections. In this case, the fuel must be drained off via the filler tube (tank neck).