Problem located and remedied !
I closed both valves to the water heater, opened the anti freeze bypass valve and fresh water inlet valve...would not pump.
Removed screen filter for the third or fourth time and applied a smear of jack's formula multilube to the rubber gasket. Reinstalled screen filter. Water came up higher in feed line but still not pumping.
Opened antifreeze filler valve and sucked on line drawing water up into both line and pump, sealed end of line with thumb and observed water did not flow back therefore no water leak. Closed antifreeze filler valve, turned on pump and all was working.
Drained water from tank so feed line was empty, refilled tank, turned on pump...did not draw water.
Got under TT and used strap ties to hold water line up to bottom of TT taking out all sagging in line...SUCCESS, all is now working!
Thank you to all who contributed.