Fuel Filter Water Sensor - Saab Parts, Saab Spares and Genuine Saab Fuel Filter Water Sensor located in the bottom of the Fuel Filter Housing. VAT (Value Added Tax) is charged at 20% on all purchases shipped within the EEC (with the exception of certain items such as books). Water in fuel sensor - removeable? - Saab Tech Talk Jun 30, 2013Water in fuel sensor - removeable? Saab Tech Talk (STT) Saab Tech Talk forums. Welcome, Classic Saab 9-5 (MY 1998-2010) » Water in fuel sensor - removeable? The sensor itself is a kind of float/resistance sensor sitting in the pot with the fuel filter, it lives under the fuel tank on the 9-5 . Logged Audax.