Found the problem! It was being caused by the new Racor vacuum gauge. I bought the T-handle adapter and gauge (genuine) Racor. At the recommendation of my lovely Admiral I changed it back to the original T-handle as it was one of the only things that changed and now it works.
Thanks for everyone's help. Now I have to bleed the thing.....
"True, your boat will outperform mine to windward, but my boat will always outperform yours at anchor." --MedSailor