Tony,
Also check the fittings at the Poly header tank. These are notorious for weeping. Try wiping around the fitting with a paper towel and check for fuel stains or moisture on the towel and the nose test. Unfortunately with these fittings you are pretty much between the proverbial rock and a hard place. Not tight enough and they weep, two tight and they strip the threads and they weep. Also, there are thread sealants that work better than others - you might want to check the archives. Lots of effort over the years trying to make these things work.