GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Blazer - 2WD 🢒 Body and Accessories 🢒 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

Fuel Level

Fuel Remaining

Voltage

18 Gallon Tank (4-Door Utility)

E

48-63 ohms

2-15%

0-10.2 L (0-2.7 gal)

0.9 V

1/4

88-99 ohms

33-38%

26.5 L (7.0 gal)

1.5 V

1/2

122-132 ohms

53-58%

39.8 L (10.5 gal)

1.7 V

3/4

155-165 ohms

68-78%

52.6 L (13.9 gal)

2.0 V

F

210-235 ohms

90-95%

60.6-68.2 L (16-18 gal)

2.4 V

Low Fuel Indicator On

67 ohms

18-20%

13.23 L (3.5 gal)

1.1 V

Low Fuel Indicator Off

73 ohms

22-24%

14.38 L (3.8 gal)

1.2 V

19 Gallon Tank (2-Door Utility)

E

55-60 ohms

11-16%

12.1 L (0-3.2 gal)

0.9 V

1/4

98-103 ohms

35-40%

27.25 L (7.2 gal)

1.4 V

1/2

130-135 ohms

55-60%

42.4 L (11.2 gal)

1.7 V

3/4

174-179 ohms

77-82%

57.54 L (15.2 gal)

2.0 V

F

200-235 ohms

90-100%

70.79 L (18.7 gal)

2.3 V

Low Fuel Indicator On

66 ohms

19-21%

14 L (3.7 gal)

1.0 V

Low Fuel Indicator Off

71 ohms

22-24%

15.9 L (4.2 gal)

1.1 V

18.5 Gallon Tank (Pick-up)

E

48-63 ohms

11-16%

11.4 L (3.0 gal)

0.9 V

1/4

82-86 ohms

35-40%

26.5 L (7.0 gal)

1.4 V

1/2

122-126 ohms

55-60%

36 L (9.5 gal)

1.7 V

3/4

164-168 ohms

77-82%

51.1 L (13.5 gal)

2.0 V

F

205-230 ohms

90-100%

64.4 L (17.0 gal)

2.3 V

Low Fuel Indicator On

66 ohms

19-21%

13.2 L (3.5 gal)

0.98 V

Low Fuel Indicator Off

70 ohms

22-24%

15.1 L (4.0 gal)

1.06 V