FUEL DELIVERY SYSTEM - V8 (Description): DESCRIPTION AND OPERATION (page 5 of 6)

FUEL DELIVERY SYSTEM - V8

19-2-8

DESCRIPTION AND OPERATION

Fuel gauge sender
The fuel gauge sender unit comprises a rotary potentiometer operated by a float. The float rises and falls with the fuel 
level in the tank and moves the potentiometer accordingly.

Battery voltage is supplied to the potentiometer. The output voltage from the potentiometer varies according to the 
resistance through the potentiometer in relation to the fuel level. The output voltage is connected to the fuel gauge in 
the instrument pack. The fuel gauge receives a battery voltage input and this is compared with the output voltage from 
the potentiometer. The difference between the two voltages determines the deflection of the fuel gauge pointer.

Fuel gauge reading

Tank volume litres (US Gallons) *

Sender unit resistance 

ohms 

Ω

FULL

95 (25)

15

3/4

71 (18.8)

36

1/2

48 (12.7)

64

1/4

24 (6.4)

110

RESERVE (fuel light ON)

11 (2.9)

158

EMPTY

0 (0)

245

*Tank volumes are approximate.