Holley/Demon Carb stumble

All i can tell yeah is i have been using this pump for over 3 years with no problem. with a mallory 4 port regulator.
I'm just going to have to find a fuel cap for a a#6 AN fitting so i can settle this once and for all.
This is my only day off so it may take a bit but this final test will be proven One Way or Another!