At 12:46 PM 11/14/2002, Joachim Preiss wrote:
>A guy here at my work moved the pump around a little left and right and got it
>to make the noise. Said that's the sound of a cracked diaphragm.
>
>I'll check out and clean the filter first, and maybe I can actually see the
>diaphragm and if it's broken. Keep you posted.

These pumps have no diaphragm, they are positive-displacement roller
pumps.  You can't get to the innards without destroying the aluminum can
they're housed in.  If the pump is buzzing against some part of the
vehicle, that needs to be addressed, both for noise and because it will
stress the rubber mounts and cause them to fail.

david
ps -- Pierburg makes pumps that work as replacements.  Fine-quality pumps
AFAIK, but they're smaller diameter than the Bosch (which they make up with
a rubber sleeve) and have a distinctly more penetrating noise.

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"