Sounds like the check valve in the diaphragm pump is in great shape. I'd bet that if you loosened a line between regulator and pump the pressure would bleed off, and that would prove the regulator wasn't responsible for holding the pressure.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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