Why these MANN-FILTER in-line fuel filters have a ‘break-through’ plastic blank

MANN FILTER in-line fuel filters WK 939, WK 939/2, WK 12 001 and WK 12 004 are equipped to hold removable sensor

Why these MANN-FILTER in-line fuel filters have a ‘break-through’ plastic blank
In-line fuel filters: WK 939, WK 939/2, WK 12 001 and WK 12 004.

MANN FILTER has published a document explaining why MANN FILTER in-line fuel filters WK 939, WK 939/2, WK 12 001 and WK 12 004 feature a ‘break-through’ plastic bung.

In the document, MANN-FILTER said: “MANN-FILTER in-line fuel filters including WK 939, WK 939/2, WK 12 001 and WK 12 004 are equipped to take a removable sensor that warns of excessive water ingress.

“However, as the sensor may not be fitted to all vehicles within a model range, these fuel filters may employ a ‘break-through’ plastic blank within the mounting hole.”

Filter fitment with water sensor

  1. Remove the plastic bung (where fitted) from the threaded water sensor mounting hole.
  2. Thread the water sensor into the mounting hole on filter (Figure 1).
  3. Continue to turn the sensor until a resistance is felt and a ‘crack’ is heard – don’t worry, this is just the sensor tip breaking through the plastic blank (Figure 2).
  4. Tighten the sensor to the vehicle manufacturer’s torque specification.
  5. Reconnect sensor wiring.

Filter fitment without water sensor

  1. Leave the plastic bung (where fitted) in the mounting hole and fit the filter as normal.

For further information about MANN-FILTER click “more details” below.

Home Page Forums Why these MANN-FILTER in-line fuel filters have a ‘break-through’ plastic blank

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