[Latitude 28]

Answered my own question....poking around inside the tank found the pick up tube laying loose.  Apparently it fell off the 1/8 nylon pipe fitting that is threaded into the tank.  This tube is just a press fit into the 1/8 pipe fitting and could be a likely spot for air to be introduced into the system.  Unless it falls off like mine.

My fix is to use a brass fitting and solder a copper pipe for the pickup tube so as this not to happen again.