Fuel tank identification
WARNING: This page is about a different car, the 1999 Audi A8, 1998 Audi A8, and 1997 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
The Audi A8 is equipped with one of two fuel tanks, with fuel capacity of either 80 liters or 90 liters. Check the first digit in the production number to tell the difference between the two tanks.
The production number is stamped on the bottom right-hand portion of the fuel tank.
- First digit "0" (e.g. D-ET 000 001) = 90 liter fuel tank
- First digit "6" (e.g. D-ET 600 001) = 80 liter fuel tank
- Disconnect electrical connections on left- and right-side fuel level sensors.
- Measure sensor resistance individually, then add values together and compare with specified values in table.
90 LITER FUEL TANK
| Fuel gauge reading | Resistance (ohm) | VAG 1301 setting | Fuel in tank (liters) | Fuel in tank (gallons) |
|---|---|---|---|---|
| Empty | 166 + 7 | 303 | 0 | 0 |
| Reserve (12 liters) | 154 + 7 | 279 | 12 | 3.2 |
| 1/4 | 131 + 7 | 234 | 22 | 5.8 |
| 1/2 | 88 + 6 | 149 | 42 | 11.1 |
| 1/1 | 12 + 4 | 0 | 87 | 23 |
| 1/1 | 9 +/- 4 | - | 92 | 24.3 |
80 LITER FUEL TANK
| Fuel gauge reading | Resistance (ohm) | VAG 1301 setting | Fuel in tank-liters | Fuel in tank-gallons |
|---|---|---|---|---|
| Empty | 166 +/- 7 | 303 | 0 | 0 |
| Reserve (12 liters) | 154 +/- 7 | 279 | 12 | 3.2 |
| 1/4 | 136 +/- 7 | 244 | 20 | 5.3 |
| 1/2 | 94 +/- 6 | 160 | 39 | 10.3 |
| 1/1 | 21 +/- 4 | 18 | 79 | 20.9 |
| 1/1 | 19 +/- 4 | 14 | 84 | 22.2 |