GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Instrument Panel, Gages, and Console 🢒 Fuel Level Specifications

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 values in the table are approximate values based on information obtained from properly operating vehicles. Actual results may vary slightly.

Fuel Gauge Display

Resistance

Sender Voltage

Fuel Level

Fuel Remaining

26.0 Gallon Tank (Short Bed Pickup and 4-Door Utility)

E

40-66 ohms

1.0 V

0-13%

0-11.9 L (0-3.1 gal)

1/4

83-110 ohms

1.25 V

30-35%

32.8 L (8.7 gal)

1/2

118-140 ohms

1.6 V

50-55%

51.3 L (13.5 gal)

3/4

150-190 ohms

2.2 V

72-78%

74.3 L (19.7 gal)

F

197-250 ohms

2.5 V

88-100%

92.8-98.4 L (24.5-25.9 gal)

Low Fuel Indicator On

62-72 ohms

1.1 V

11-17%

16.5 L (4.3 gal)

Low Fuel Indicator Off

74-83 ohms

1.2 V

14-25%

18.9 L (5 gal)

33.0 Gallon Tank (Suburban 1500 and 2500 Series)

E

40-58 ohms

0.9 V

0-13%

0-15.1 L (0-4 gal)

1/4

83-110 ohms

1.25 V

30-35%

41.6 L (11 gal)

1/2

118-148 ohms

1.9 V

50-55%

64.4 L (17 gal)

3/4

155-195 ohms

2.3 V

68-78%

84 L (22.2 gal)

F

199-250 ohms

2.5 V

88-100%

118.8-123.4 L (31.4-32.6 gal)

Low Fuel Indicator On

55-69 ohms

0.9 V

11-17%

14.3 L (3.80 gal)

Low Fuel Indicator Off

70-80 ohms

1.1 V

14-26%

19.3 L (5.1 gal)

34.0 Gallon Tank (Long Bed Pickup)

E

40-6 ohms

1.0 V

4-14%

4.5-15.7 L (1.2-4.1 gal)

1/4

80-11 ohms

1.5 V

30-36%

43.8 L (11.6 gal)

1/2

117-15 ohms

1.8 V

50-58%

70.4 L (18.6 gal)

3/4

155-195 ohms

2.1 V

70-80%

97.2 L (25.7 gal)

F

196-250 ohms

2.5 V

88-99%

123.6-126.9 L (32.6-33.5 gal)

Low Fuel Indicator On

61-72 ohms

1.1 V

11-14%

22.7 L (6 gal)

Low Fuel Indicator Off

76-83 ohms

1.2 V

13-25%

25.7 L (6.8 gal)

39.0 Gallon Tank (Suburban 2500 Series)

Important: 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.

The fuel remaining values are approximate.

E

12-29 ohms

1 V

2-14%

18.9 L (5 gal)

1/4

30-40 ohms

1.5 V

31-34%

45.4 L (12 gal)

1/2

43-64 ohms

1.8 V

50-58%

73.8 L (19.5 gal)

3/4

65-79 ohms

2.0 V

70-76%

98.4 L (26 gal)

F

95-125 ohms

2.4 V

87-100%

138.1-147.6 L (36.5-39 gal)

Low Fuel Indicator On

25-35 ohms

1.0 V

11-13%

28.3 L (7.5 gal)

Low Fuel Indicator Off

36-41 ohms

1.1 V

14-16%

30.2 L (8 gal)