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Different shapes of the fuel tank led to the appearance of fuel gauge sensors with a different design. The main distinguishing feature of the sensors is that the rectangular float sensor is installed on front-wheel drive vehicles, while the ball float sensor is installed on quattro vehicles.
Fuel gauge sensor - removal and installation
Attention! When removing the fuel gauge sensor, the tank must be filled to a maximum of ⅔ to avoid fuel leakage.
1. Turn away a covering of a floor of a luggage carrier.
2. Unscrew the black cover.
3. Disconnect the multi-pin plug.
4. Squeeze the leashes of the fuel return line connectors and disconnect it (see illustration).
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5. Disconnect the fuel supply line.
6. Turn away a plastic cap nut. Usually this nut is tightened tightly and turns away with difficulty. It is recommended in such cases to install a screwdriver on the face of the nut and, by hitting the handle of the screwdriver with a hammer, loosen the nut.
7. Remove the fuel tank connecting flange by pulling it up. If necessary, disconnect the fuel return pipe connecting pipe from the back of the flange by squeezing its leashes.
8. Put your hand into the fuel tank and remove the fuel gauge sensor by depressing the fastening latch on the lower pump housing (see illustration). This part of the pump is glued on and cannot be removed from the fuel tank.
![](https://www.audimanual.ru/img/80/1446.jpg)
9. Disconnect the sensor plug on the connecting flange (see illustration).
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10. Moisten the o-ring of the connecting flange before installing it. When installing the connecting flange, follow the reference marks. The arrow on the flange should be opposite the mark on the tank (see illustration).
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For vehicles with the KE-III-Jetronic injection system, a hydraulic accumulator is mounted on the connecting flange, which ensures a constant fuel pressure in the system after the engine is turned off.
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