At 04:15 PM 8/18/2012, David Bartolini wrote:
>Now I don't mean to interfere, my fuel pump has had a whine in it
>for years and works fine.

They can operate fine like that (although the cavitation could
potentially wear them, as the collapsing bubbles can knock metal off
ship propellers, pump rotors etc. - big expensive issue with
propellers).  And there may be another reason for the pump to whine,
not related to cavitation.  But the usual reason for one of our fuel
pumps to be audible over an idling engine (normally from driver's
seat barely audible with engine off) is that the inlet is restricted
in some way.  On vans with a filter upstream of the pump, that's a
good time to check/replace that filter.  Crud on the filter sock
inside the tank will give the same effect.

Yours,
David