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Re: Fuel filter intervals on Audi 4000

<4000 fuel filters...1 paper and one metal...??
 So, on my 87 4000S, 4-cyl., the large aluminum canister that is near the
  fuel pump IS a filter.  Everything that I have read said that it is an
 accumulator.  Is this indeed a part that must be replaced regularly?  I have
 already replaced the small, paper inline, pre-filter that is in the low
 pressure line coming from the tank.  What gives?