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Mini Fuel Filter

Many Volkswagens equipped with CIS or CIS-E fuel injection have a mini fuel filter installed in the system to collect any contaminants which may have been trapped in the system during manufacturing. The filter, shown in Fig. 5-6, is a small mesh screen built into the fuel inlet union bolt on the fuel distributor. The bolt with the mini filter is identified by a disc shape on its head. Removal of the mini filter is a one-time procedure. The old bolt/filter is replaced with a new union bolt (Volkswagen part no. N 021 071 2) and two new sealing washers (Volkswagen part no. N 013 812 2). Torque the new union bolt to 20 Nm (15 ft. lb.).


Fuel will be expelled when the filter is removed. Do not smoke or work near heaters or other fire hazards. Keep a fire extinguisher handy.


Thoroughly clean the area around the union bolt before removing it, and make sure that no dirt enters the fuel lines.

Fig. 5-6. Fuel line union bolt with mini fuel filter. (CIS-E fuel injection shown CIS fuel injection is similar).

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