GM Service Manual Online
For 1990-2009 cars only

The information in this table is intended for use with the J 33431-C Signal Generator and Instrument Panel Tester. The fuel level sensor values represent the test values to be used on the Signal Generator to drive the fuel gage display to the indicated positions. Vehicles that require more than one fuel level sensor calculate gage position from many possible resistance combinations of fuel levels between the two tanks. Therefore, the values in the table may not correlate directly to readings taken from the vehicle primary or secondary sending units.

The resistance values only reflect the specified fuel level when the signal circuits for both the primary and secondary fuel level senders are tied together.

Fuel Gage Display

Fuel Level Sensor Right - Primary

Fuel Level Sensor Left - Secondary

Fuel Level

Fuel Level Remaining Parameter

Resistance

Volts

Resistance

Volts

E

40-57 ohms

0.71-0.95 V

40 ohms

0.71 V

1 Gallon

3.8L (1.0 gal)

1/4

191 ohms

2.20 V

40 ohms

0.71 V

5.9 Gallons

22.3L (5.9 gal)

1/2

250 ohms

2.54 V

40 ohms

0.71 V

9.9 Gallons

37.5L (9.9 gal)

3/4

250 ohms

2.54 V

164 ohms

2.01 V

14.1 Gallons

53.4L (14.1 gal)

F

250 ohms

2.54 V

215-250 ohms

2.35-2.50 V

18-20 Gallons

68.1-75.7L (18.0-20.0 gal)