[urq] Warning about Fuel Pressure Accum.

[Bill Bennett]

oh please, you have to be kidding, there is no way that would help a pressure loss on a hot start, the starter time would be lessened nada. sheet Phil, Scott, ECB, no one is dealing with these newbies? you know I do not have the patience to deal with them politely.Bill
  ----- Original Message ----- 
  From: Patrick Carlier 
  To: SpotatAshleys ; Ben Swann 
  Cc: urq at audifans.com ; quattroguy83 at yahoo.com ; quattro at audifans.com 
  Sent: Wednesday, January 28, 2004 1:20 PM
  Subject: Re: [urq] Warning about Fuel Pressure Accum.


  Keith , have you tried this :

  Turn on the ign key , but don't crank .
  You should be able to hear the the fuel pump running for a few seconds .
  Repeat this several times in a row : allow the pump to run till it switches
  of ,
  switch off the ign and turn the pump back on .
  This will allow you to build up pressure on the fuel system .

  If after that the car starts normal or much better , you have either a
  leaking check valve
  or a broken accumulator .

  Pat


  ----- Original Message -----
  From: "SpotatAshleys" <spotatashleys at hotmail.com>
  To: "Ben Swann" <benswann at comcast.net>
  Cc: <urq at audifans.com>; <quattroguy83 at yahoo.com>; <quattro at audifans.com>
  Sent: Wednesday, January 28, 2004 8:59 PM
  Subject: Re: [urq] Warning about Fuel Pressure Accum.


  > Thanks Ben (and others too)
  > In an effort to cure the long cranking I replaced all the injectors first
  > but still have the problem hence my questions now about the accumulator.
  The
  > battery is brand new and very good. It always starts (so far) but after an
  > inordinate time cranking.
  > It looks like keep replacing things till it starts properly and the
  > accumulator could be next unless someone has a bright idea.
  > Thanks again
  >
  > Keith
  >
  > '87 WR
  > ----- Original Message -----
  > From: "Ben Swann" <benswann at comcast.net>
  > To: <ashleyj.cobain at virgin.net>
  > Cc: <urq at audifans.com>; <quattroguy83 at yahoo.com>; <quattro at audifans.com>
  > Sent: Wednesday, January 28, 2004 5:27 PM
  > Subject: [urq] Warning about Fuel Pressure Accum.
  >
  >
  > As you mention, when operating correctly, the accumulator should help
  > maintain the fuel pressure to around 35 PSI after shutoff if there are no
  > leaks in the system.
  >
  > The FP accumulator also act as a damper to smooth out pulses/spikes in the
  > pressure.  Analogous to the vertical tube a plumber would install to
  prevent
  > water hammer when a faucett is closed rapidly in a plumbing system, but
  also
  > similar to the water pressure accumulator used on well fed systems - a
  tank
  > that holds water with a bladder full of air at the top.  The accumulator
  on
  > the fuel injection system uses a spring instead of air to maintain this
  > pressure.
  >
  > As you allude to a faulty pressure accumulator can cause hard starting,
  long
  > cranking.  I have found more often, a leakdown on the injector side of the
  > system is the problem, and the accumulator is secondary.
  >
  > Ben
  >
  > [Please excuse my ignorance but what is the precise function of the fuel
  > accumulator?
  > It is supposed to maintain system pressure when the engine switched off?
  In
  > other words could this be my problem with cold starts? Hot starts are
  fine.
  > Mixture is not a problem during cold starts, once started. The warm up
  > regulator is working because the air fuel meter shows it is doing it's
  job.
  > The problem is that I have to crank it lots before it fires. Is this
  because
  > it has lost system pressure over night and I then have to crank for fuel
  > pump to restore pressure?
  >
  > Look forward to receiving your thoughts
  >
  > Keith
  >
  > '87 WR]
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