"O. Sami Saydjari" wrote:

Just to be clear, I do not think he reversed the inlet and outlet
connections. What happened is that he put on a Lycoming vacuum pump
that turned the opposite direction from the proper pump meant for my
Continental Engine in my Piper Turbo Arrow III (TSIO-360-FB). My POH
does not seem to have a schematic of the vacuum system, so I am not sure
exactly what went on with the air flow with respect to the filters.

If the pump is being turned backwards, it will no produce any appreciable air
flow in either direction.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.