Fuel Level Specifications

The information in this table is intended for use with the J 33431-C Signal Generator and Instrument Panel Tester. See Special Tools and Equipment . 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 (Short Bed Pickup and 4-Door Utility)
E	197-250 Ω	2.5 V	0-13%	0-11.9 L (0-3.1 gal)
1/4	150-190 Ω	2.2 V	30-35%	32.8 L (8.7 gal)
1/2	118-140 Ω	1.6 V	50-55%	51.3 L (13.5 gal)
3/4	83-110 Ω	1.25 V	72-78%	74.3 L (19.7 gal)
F	40-66 Ω	1.0 V	88-100%	92.8-98.4 L (24.5-25.9 gal)
Low Fuel Indicator On	208-218 Ω	2.4 V	11-17%	16.5 L (4.3 gal)
Low Fuel Indicator Off	195-206 Ω	2.3 V	14-25%	18.9 L (5 gal)
31.0 Gallon Tank (Suburban 1500 and 2500 Series)
E	199-250 Ω	2.5 V	0-13%	0-15.1 L (0-4 gal)
1/4	155-195 Ω	2.3 V	30-35%	41.6 L (11 gal)
1/2	118-148 Ω	1.9 V	50-55%	68.1 L (18 gal)
3/4	83-110 Ω	1.25 V	68-78%	89 L (23.5 gal)
F	40-58 Ω	0.9 V	88-100%	111.3-117 L (29.4-30.9 gal)
Low Fuel Indicator On	211-235 Ω	2.5 V	11-17%	14.3 L (3.80 gal)
Low Fuel Indicator Off	210-220 Ω	2.4 V	14-26%	19.3 L (5.1 gal)
34.0 Gallon Tank (Long Bed Pickup)
E	196-250 Ω	2.5 V	4-14%	4.5-15.7 L (1.2-4.1 gal)
1/4	155-195 Ω	2.1 V	30-36%	43.8 L (11.6 gal)
1/2	117-151 Ω	1.8 V	50-58%	70.4 L (18.6 gal)
3/4	80-112 Ω	1.5 V	70-80%	97.2 L (25.7 gal)
F	40-62 Ω	1.0 V	88-99%	123.6-126.9 L (32.6-33.4 gal)
Low Fuel Indicator On	218-229 Ω	2.4 V	11-14%	22.7 L (6 gal)
Low Fuel Indicator Off	207-214 Ω	2.3 V	13-25%	25.7 L (6.8 gal)
37.0 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	190-250 Ω	2.4 V	2-14%	18.9 L (5 gal)
1/4	130-158 Ω	2.0 V	31-34%	43.2 L (11.4 gal)
1/2	85-128 Ω	1.8 V	50-58%	70 L (18.5 gal)
3/4	60-80 Ω	1.5 V	70-76%	93.5 L (24.7 gal)
F	24-58 Ω	1.0 V	87-100%	132.5-140.1 L (35-37 gal)
Low Fuel Indicator On	220-240 Ω	2.5 V	11-13%	28.3 L (7.5 gal)
26.0 Gallon Tank (Short Bed Pickup and 4-Door Utility) 5.3L Only
E	40-66 Ω	1.0 V	0-13%	0-11.9 L (0-3.1 gal)
1/4	83-110 Ω	1.25 V	30-35%	32.8 L (8.7 gal)
1/2	118-140 Ω	1.6 V	50-55%	51.3 L (13.5 gal)
3/4	150-190 Ω	2.2 V	72-78%	74.3 L (19.7 gal)
F	197-250 Ω	2.5 V	88-100%	92.8-98.4 L (24.5-25.9 gal)
Low Fuel Indicator On	62-72 Ω	1.1 V	11-17%	16.5 L (4.3 gal)
Low Fuel Indicator Off	74-83 Ω	1.2 V	14-25%	18.9 L (5 gal)
31.0 Gallon Tank (Suburban 1500 and 2500 Series) 5.3L Only
E	40-58 Ω	0.9 V	0-13%	0-15.1 L (0-4 gal)
1/4	83-110 Ω	1.25 V	30-35%	41.6 L (11 gal)
1/2	118-148 Ω	1.9 V	50-55%	68.1 L (18 gal)
3/4	155-195 Ω	2.3 V	68-78%	89 L (23.5 gal)
F	199-250 Ω	2.5 V	88-100%	111.3-117 L (29.4-30.9 gal)
Low Fuel Indicator On	55-69 Ω	0.9 V	11-17%	14.3 L (3.80 gal)
Low Fuel Indicator Off	70-80 Ω	1.1 V	14-26%	19.3 L (5.1 gal)
34.0 Gallon Tank (Long Bed Pickup) 5.3L Only
E	40-62 Ω	1.0 V	4-14%	4.5-15.7 L (1.2-4.1 gal)
1/4	80-112 Ω	1.5 V	30-36%	43.8 L (11.6 gal)
1/2	117-151 Ω	1.8 V	50-58%	70.4 L (18.6 gal)
3/4	155-195 Ω	2.1 V	70-80%	97.2 L (25.7 gal)
F	196-250 Ω	2.5 V	88-99%	123.6-126.9 L (32.6-33.4 gal)
Low Fuel Indicator On	61-72 Ω	1.1 V	11-14%	22.7 L (6 gal)
Low Fuel Indicator Off	76-83 Ω	1.2 V	13-25%	25.7 L (6.8 gal)
Low Fuel Indicator Off	208-218 Ω	2.4 V	14-16%	30.2 L (8 gal)