2 HP is probably oversized for a 2 inch pipe, but since this is a new
problem, that isn't the issue.

Since this happened when you switched the pool vac to manual, I'd think air
leak in that valve.

To check for obstructions, if you have some suction, I've tied a nut [any
small object which will negotiate the bends] on a strong [you probably don't
want this to break] nylon line and let the pump suck it from the skimmer. If
you get through, there is probably no obstruction; or you can tie a larger
nut on when it reaches the strainer and pull back through the skimmer.



"Lee" wrote in message
...
I realize this is not directly related to the purpose of this group,
so if you know of a better place for me to ask, please let me know.

We have a problem with our Pentair-WhisperFlo pool pump. It is not
able to fully prime, even with addition of water into the pump body
directly (via the volute/strainer basket). It seems able to draw
about 1/2 the amount it needs to fully prime and operate. We have
replaced the pump impeller, and have tried to clear the inlet line (1
inch PVC pipe) through pressure from a garden-hose expansion nozzle
from both directions. Nothing has worked. We believe there is
probably a blockage/obstruction of some kind in the pipe between the
pool and the pump (perhaps a tree root that has gradually penetrated
the pipe).

Does anyone have any ideas of what else we can do to find out if there
is an obstruction in this inlet pipe? Our resources are quite tight,
so hiring a plumber to come in with specialized/optical equipment
would be beyond our reach at this point.

Thanks for any suggestions you may have.

Lee