[s-cars] Mysterious fuel pump problem at start

[calvinlc@earthlink.net]

I had a similar issue, although no slope of road dependencies, and it turned
out to be the fuel pressure regulator.  Cheap and 15 minutes to replace.
get a fuel pressure gauge and hook it up.  If you can replicate the problem
and the fuel pressure is good then it is almost certainly a cam position
sensor.  If you see the pressure bleed down after the car is shut off then
it is either the FPR or the check valve in the pump.
--Calvin


-----Original Message-----
From: s-car-list-bounces+calvinlc=earthlink.net at audifans.com
[mailto:s-car-list-bounces+calvinlc=earthlink.net at audifans.com]On Behalf
Of hartmann
Sent: Friday, September 30, 2005 3:25 PM
To: s-car-list at audifans.com
Subject: [s-cars] Mysterious fuel pump problem at start


Here's a little intermittent problem I've been struggling with for a while.

About eight months ago, my '95 S6 was driven from Santa Cruz to San
Francisco and parked on a hill (facing up hill) for about 10 min.  Came
out, S6 wouldn't start.  Moved the car to a flat spot and it started.
This near exact thing happened three more times.

Then it happened on the flat area at a gas station.  After cranking the
car for few minutes, I talked to the mechanic at the station and came to
show him what was going on and ... yes, viola, the S6 starts without a
problem.  Clearly, the car is developing a sense of humor.

With some help from Lou @ Dieter's in Mountain View, we tried a few
things and with replacing the fuel pump relay, the problem vanished.
Hooray!

Until last week.  It's back -- random fuel pump outage at startup.  I
think it's the relay again, but why would that happen twice?  I'm
wondering if there's another issue.  You have any ideas?

BTW, if the car starts, it runs fine.  It has so far, never (knock on
wood) had a problem after it starts.

Thanks,

Hartmann
'95 S6
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