Source of pressure doesn't matter as long as there is some pressure. Agree that it must be a bypass valve somewhere. I had the same problem first time out with my Dad's RV. Took me a couple days to find it under the bathroom sink behind a small panel that was screwed in. Was getting a little ripe by then.
Most newer rigs have it in the wet bay.
Maybe post your year and model if you are still having trouble finding it.
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97 Fleetwood Bounder 36S on F53 chassis 460 with as many quads on the trailer that I can fit or get running!
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