Thanks Ricky. I suspect the gasket that seals the cup is dried out and is not sealing properly. I will have to go online and find a replacement.
The good news is that I suddenly recalled having purchased a kit last year that included a case, three HVLP guns, and a set of cleaning tools. I got out the biggest gun and it worked great. I had always wanted to try a gravity feed gun and I was very pleased with the results over the siphon feed.