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Volkswagen Polo Workshop Manuals - Auto Repair Service

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Accelerator mechanism > < Removing and installing fuel filter (CFWA)

Fuel Hoses for CFWA Engine: Polo Mk5 Diesel Fuel Filter

Fuel hoses in the engine compartment (CFWA)
Fuel hoses in the engine compartment (CFWA)
  Note
   
t  On this engine, the connections for the pressurised fuel hoses have a so-called 3-ribbed section (arrows). This reduces the likelihood of fuel system leaks.
t  When removing the fuel hoses, the very thin sealing layer on the inside of the fuel hoses is usually damaged.
t  This damage cannot be detected with the naked eye. After some time, this may lead to leaks in the fuel system.
t  When fitting the fuel hoses on the connections again, it is impossible to guarantee that the position of the hoses on the three ribs will be the same as before. This also leads to a tendency to form leaks.
  Caution
Once the fuel hoses have been removed from connections with a 3-ribbed section, they must be replaced with new ones.
  S01-0139
-arrows-3-ribbed section
-1-Fuel rail
-2-Return line
-3-Supply connection for the high-pressure pump
-4-Quick-release coupling on the fuel filter

  Note
t  For the reasons already mentioned, the quick-release coupling must always be released when pulling the fuel hoses off the fuel filter → Chapter.
t  Do not open the spring clip and pull the fuel hose off the connection.
t  When other components are removed - check whether it is possible to disconnect the fuel system at the quick-release couplings on the fuel filter or on the connection points in the engine compartment.
If a fuel hose cannot be removed from the connections by hand:
  Caution
Never insert a screwdriver or similar tool between the hose and the connection!
Risk of damage to the connection - Component has to be renewed.
–  Turn fuel hose with suitable pliers and pull off hose.
If fuel hose still cannot be removed from the connection:
–  Only cut open the textile layer of the fuel hose lengthways and pull hose off.
l  The inner rubber layer must not be cut. If the connection is damaged, the entire component must be renewed.
  Note
t  Before attaching a new fuel hose, remove grease, oil and dirt thoroughly from the hose connection. Do not use any metal tools to do this as they could damage the hose connection.
t  Attach fuel hose to connection without lubricant and then secure with spring-type clip.
   

Accelerator mechanism > < Removing and installing fuel filter (CFWA)