Gday Drac,

Mate its always informative talking to you over the net.As always these threads tend to digress from the original question which in my case was fuel leak from injector.
I have fixed the problem by changing the diaphram .
As far as cavitation is concerned what you say is true but it comes in other forms as well like constricting a liquid which is what I think is happening in our engines pumps.

regards