Fuel Filter Unit - Volkswagen V10-TDI Manual

Engine Mechanics
Fuel Filter
Unit
Fuel Return from the
Pump-Jet Units
Fuel Preliminary
Run to Fuel Pump
Fuel Return from the
Pump-Jet Units
34
303_029
Drainage
Fuel Filter Lid

Fuel Filter Unit

The fuel filter unit is located in a crash-safe
position in the V-space of the engine. It contains
two filter inserts and a sensor for the fuel
contamination. The sensor for the fuel
contamination is used to inform the driver if the
water level in the filter unit is too high, using an
indicator light in the dash panel insert.
There is a preheating valve in the lid of the fuel
filter unit; when the outside temperature is low,
this guides the fuel in the return flow from the
engine back into the filter. In the Touareg, a
coolant-fuel cooler is integrated into the fuel
filter unit. It cools the fuel flowing back into the
fuel tank, thus preventing damage to the fuel
tank by return flow fuel that is too hot.
Return Flow to Fuel Tank
Preliminary Run of Fuel Tank
Fuel Contamination Sensor
Coolant Connection
Fuel Cooler
303_030