Removal the fuel sensor
Important: The fuel tank must be filled to a maximum of 2/3, otherwise the fuel will spill out!
Fold back the luggage compartment carpet.
Unscrew the black protective cover.
Remove the multi-pin plug.
Mark and remove the drain and vent pipes.
Unscrew the fuel supply line.
Unscrew the plastic union nut. Most often, it sits very tightly. That's why Audi repair shops use a special key to remove it.
If you don't have this key, do the following: put a screwdriver as blunt as possible against one of the nut edges and loosen the nut with light hammer blows on the handle rod. If necessary, use it on other edges.
Left: First step to removing the fuel sensor. The protective cover (1) has been unscrewed. Now the multi-pin plug (2), the fuel supply line (3) and the drain line (4), as well as the vent line (5) can be removed.
Right: The plastic union nut is unscrewed using a special tool (2) using a ratchet (1).
Mark the relative positions of the sensor and the tank. Now the fuel sensor can be lifted up a little.
From the inside of the fuel sensor, remove the fuel line and disconnect the fuel sensor plug.
Before installation, moisten the sealing ring of the protective flange with fuel.
Pay attention to the markings when installing the fuel sensor so that the pipe connections point in the correct direction and the sensor float is positioned correctly.
(The original text is available on the website: AudiManual.ru)