I got it........... Most people would have given up on this long ago... But I figured,, this isn't rocket science,,and it has minimal moving pieces..
I put another gun tube on the pump side,, it didn't work... I took the other pump on the defective gun tube,,it worked... SO I know it's the def. pump..
I degreased the bad pump and was about to dismantle it when I saw degreaser being pushed out a small hole on the tube side ( underneath )....I pushed a small piece of wire into the hole ,,,and with the flex hose removed,, I pushed up a small spring and ball bearing.. I proceeded to clean that and found a little strip of what looks like cellophane..
It appears the cellophane was holding the little ball bearing off it's seat and when I would pump it ,, it would just pump it right back into the tube, with no back pressure,,acting like it wasn't getting primed.. The little ball is the size of this letter ( o ) and the cone shaped spring against it.. I assume it is also a small bleeder or air out... Anyway My new grease gun works like new again....
Thanks to all who help resolve this frustrating issue and their tips and tricks to a must have tool we all use every day..