Thanks for the replies. I looked under the floorboards today for a manifold or something regulating flow from/to either tank. Plumbing is all tight but only T connectors, no valve. I opened P/S tubes and both showed positive flow, though port side seemed slower. I then went to the port tank and and found a cracked tightener on the filler tube, which I sealed with rescue tape. Not sure that would be a factor in the issue. Joe, I do suspect a venting issue and will try to hunt that down tomorrow;)
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