GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC C Sierra - 2WD 🢒 Body 🢒 Wiring Systems 🢒 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 Gage Display

Resistance

Sender Voltage

Fuel Level

Fuel Remaining

26.0 Gallon Tank

E

197-250 ohms

2.5 V

0-13%

0-11.9 L (0-3.1 gal)

1/4

150-190 ohms

2.2 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

83-110 ohms

1.25 V

72-78%

74.3 L (19.7 gal)

F

40-66 ohms

1.0 V

88-100%

92.8-98.4 L (24.5-25.9 gal)

Low Fuel Indicator On

208-218 ohms

2.4 V

11-17%

16.5 L (4.3 gal)

Low Fuel Indicator Off

195-206 ohms

2.3 V

14-25%

18.9 L (5 gal)

31.0 Gallon Tank

E

199-250 ohms

2.5 V

0-13%

0-15.1 L (0-4 gal)

1/4

155-195 ohms

2.3 V

30-35%

41.6 L (11 gal)

1/2

118-148 ohms

1.9 V

50-55%

68.1 L (18 gal)

3/4

83-110 ohms

1.25 V

68-78%

89 L (23.5 gal)

F

40-58 ohms

0.9 V

88-100%

111.3-117 L (29.4-30.9 gal)

Low Fuel Indicator On

211-235 ohms

2.5 V

11-17%

14.3 L (3.80 gal)

Low Fuel Indicator Off

210-220 ohms

2.4 V

14-26%

19.3 L (5.1 gal)

34.0 Gallon Tank

E

196-250 ohms

2.5 V

4-14%

4.5-15.7 L (1.2-4.1 gal)

1/4

155-195 ohms

2.1 V

30-36%

43.8 L (11.6 gal)

1/2

117-151 ohms

1.8 V

50-58%

70.4 L (18.6 gal)

3/4

80-112 ohms

1.5 V

70-80%

97.2 L (25.7 gal)

F

40-62 ohms

1.0 V

88-99%

123.6-126.9 L (32.6-33.4 gal)

Low Fuel Indicator On

218-229 ohms

2.4 V

11-14%

22.7 L (6 gal)

Low Fuel Indicator Off

207-214 ohms

2.3 V

13-25%

25.7 L (6.8 gal)

37.0 Gallon Tank (Dual Fuel Level Senders)

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

190-250 ohms

2.4 V

2-14%

18.9 L (5 gal)

1/4

130-158 ohms

2.0 V

31-34%

43.2 L (11.4 gal)

1/2

85-128 ohms

1.8 V

50-58%

70 L (18.5 gal)

3/4

60-80 ohms

1.5 V

70-76%

93.5 L (24.7 gal)

F

24-58 ohms

1.0 V

87-100%

132.5-140.1 L (35-37 gal)

Low Fuel Indicator On

220-240 ohms

2.5 V

11-13%

28.3 L (7.5 gal)

Low Fuel Indicator Off

208-218 ohms

2.4 V

14-16%

30.2 L (8 gal)

50.0 Gallon Tank (Dual Fuel Level Senders)

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

185-250 ohms

2.5 V

0-15%

28.4 L (7.5 gal)

1/4

130-160 ohms

2.1 V

30-36%

64.4 L (17 gal)

1/2

84-130 ohms

1.8 V

50-58%

94.6 L (25 gal)

3/4

58-81 ohms

1.4 V

70-81%

140.1 L (37 gal)

F

25-60 ohms

1.0 V

85-100%

117.9-189.3 L (47-50 gal)