Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 gauge display to the indicated positions. Vehicles that require more than one fuel level sensor calculate gauge 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 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) |
| 33.0 Gallon Tank (Suburban 1500 and 2500 Series) | ||||
| 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% | 64.4 L (17 gal) |
| 3/4 | 155-195 Ω | 2.3 V | 68-78% | 84 L (22.2 gal) |
| F | 199-250 Ω | 2.5 V | 88-100% | 118.8-123.4 L (31.4-32.6 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) | ||||
| E | 40-6 Ω | 1.0 V | 4-14% | 4.5-15.7 L (1.2-4.1 gal) |
| 1/4 | 80-11 Ω | 1.5 V | 30-36% | 43.8 L (11.6 gal) |
| 1/2 | 117-15 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 (32.6-33.5 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) |
| 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 Ω | 1 V | 2-14% | 18.9 L (5 gal) |
| 1/4 | 30-40 Ω | 1.5 V | 31-34% | 45.4 L (12 gal) |
| 1/2 | 43-64 Ω | 1.8 V | 50-58% | 73.8 L (19.5 gal) |
| 3/4 | 65-79 Ω | 2.0 V | 70-76% | 98.4 L (26 gal) |
| F | 95-125 Ω | 2.4 V | 87-100% | 138.1-147.6 L (36.5-39 gal) |
| Low Fuel Indicator On | 25-35 Ω | 1.0 V | 11-13% | 28.3 L (7.5 gal) |
| Low Fuel Indicator Off | 36-41 Ω | 1.1 V | 14-16% | 30.2 L (8 gal) |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.