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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.).

WARNING-

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.

CAUTION-

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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