Recommendation. Violations in the operation of the fuel gauge sensor are most often associated with wear of the contact part of its rheostat. This can be verified by measuring its electrical resistance with an ohmmeter while smoothly moving the lever with the float from one extreme position to another. A defective fuel gauge sensor should be replaced.
Removing
1. Remove the fuel module (see "21124 engine fuel pump fuel module (1,6i) - removal, installation, replacement").
2. The cover of the fuel pump module is held on two rails. A spring is put on one of the guides. The spring is fixed with a retaining ring installed in the upper annular groove of the guide. To remove the fuel gauge sensor with a slotted screwdriver with a narrow blade, pry off and slide the retaining ring into the lower groove of the guide.
3. Raise the cover of the fuel pump fuel module.
4. Remove the wire tip from the output of the fuel pressure regulator.
5. Press the wire connector lock...
... and disconnect the connector from the fuel pump fuel module cover.
6. Use a slotted screwdriver to release the fuel pump wire connector retainer.
7. Disconnect the connector from the fuel pump.
8. We release two clamps of the sensor.
9. We shift the sensor along the grooves of the fuel pump module housing and remove it.
Installation
We install a new fuel gauge sensor on the car and all the removed parts in reverse order.