Dealer replaced the fuel pump and associated relay after checking all possible causes (Including the earth connection). A couple of theories put forward which led to the fuel pump as culprit.
In an associated note, would anyone venture a guess as to why the fuel filter is mounted in the return line rather than the delivery line?
Brought the 5 speeder home Friday (40+ miles) then yesterday motored out to Lime Rock Park, then to Old Rhinebeck Aerodrome, then home (Another 100+ miles) and all's well...plus I arrived home before the rains came! Happy Morganing to all!