Discovery II
INSTRUMENTS
88-10
DESCRIPTION AND OPERATION
Fuel tank sender unit
The fuel tank sender unit is combined with the pump. It contains a variable resistor with change in resistance
proportional to the change in level of fuel in the tank.
The resistance of the fuel tank sender unit in relation to tank contents and gauge display is shown in the table below:
The fuel tank sender unit input voltage feed is supplied from the fuel gauge. The earth path return circuit of the sender
unit is connected to the instrument pack.
Tank contents
Sender resistance, ohms
Gauge display
Empty
245
0
Full
19
1