A B12828 fuel filter installed in a fuel pipe is call external filter. By contrast, an internal filter is installed in a fuel pump or a fuel tank. A fuel filter or its protective bush located in a fuel tank is normally regarded as a maintenance-free part.
The fuel filters on many imported cars adopt banjo fittings. In order to guarantee sealing reliability, repeated use of the same gasket is prohibited. The sealing performance of a new gasket should be checked immediately after installation. If an O-ring in a fuel system has to be replaced, the specification and model of the replacement O-ring should be checked to guarantee correct elasticity and hardness.
A loop-free fuel system contains only one internal filter (inside the fuel tank). Despite the high cost of such an all-in-one structure consisting of pump, filter, and transfer unit, timely and proper maintenance and servicing is necessary if the fuel transfer is impeded or the engine performance is degraded as a result. In the meanwhile, all fuel pipes should be examined for possible faults, and any signs of crack or curled edge of the hose clamps should be identified.

Name: fuel filter/gasoline/with valve/4BAR
Ref No.: 6Q0201051C/6Q0201051J
Applicable models:
Skoda: FAB05-11/OCT04-09/RO06-11/SUP08-
VW: BE03-10/BO03-05/CA04-11/EOS06-11/GO04-/JE06-/PO05-/TOU03-10
SEAT: ATT04-10/CO06-09/IB06-11/TO05-09
Audi: A3 04-/ATT07-10