Ok - so I built a new pool shed this spring and changed my plumbing adding about 8' of intake pipe (From where the return line comes out of the ground - to the pump) there are also 2 90 degree joints in that run. I can get prime even with an almost empty pump basket but as soon as I connect my Kreepy Crawly or my manual vacuum hose I lose suction - the pump tires to keep priming .. almost primes .. then blamo a dry pump until I unplug the hose and it re-primes itself.
I have also checked every connection - added glue just incase etc.. Tightened everything all over again etc.. There is a small bubble of air in the pump but no bubbles coming into the pool from the return jets.
I assume that my 3/4hp is too small for the new configuration - but I just wanted to check here first.