Bruce,
You probably have a vented loop above the hull valves under the sink. See a couple of photos from my boat: https://1drv.ms/f/s!AhpB-lul9d5YpA6iE5rK2Qye1-_N. Its’ purpose is to break the siphon from the head discharge back to the head when the system is lined up for direct discharge overboard. Your hull discharge valve should be locked shut and the “Y” should be locked so the head discharges to the holding tank. The backflow in your head is most likely caused by the joker valve leaking fluid from the line to the “Y” valve (and subsequently the holding tank) back into the head. I’ve had issue with the holding tank vent line being clogged so pressure built up inside the holding tank which exacerbated the problem. To clear the vent line, I ended up pumping the holding tank while back flushing the vent line. Hope this helps, Ron Ron Ricci S/V Patriot C&C 37+ Bristol, RI <mailto:ron.ri...@1968.usna.com> ron.ri...@1968.usna.com From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bruce Whitmore via CnC-List Sent: Monday, March 6, 2017 9:53 PM To: C&C List Cc: Bruce Whitmore Subject: Stus-List 1994 C&C 37/40+ head sanitation hose vented loop Hello all, Perhaps those of you with a 37/40+ can provide some guidance. The surveyor suggested adding a vented loop to the waste hose leading from the head to the through-hull. This makes sense to me. However, in looking at the hose, it seems to lead from the through-hull under the sink, way up, probably behind the mirror/medicine cabinet assembly, and then back down to the y-valve leading to the head. I'm guessing that vented loops were standard back in '94, so there may be one up where I cannot see the top of the loop. I'm also a bit concerned about getting very stiff hose to actually attach well to the vented loop. The head tends to backfill waste up about 1/3 of the way, especially if it is not vigorously pumped and the handle locked down. It is a Jabsco. I am happy to replace the joker valve simply to be proactive. If, however there is a need for a vented loop to prevent backfilling, I'd like to put one in. The question is, how would I get to the top bend of the sanitation hose? Thanks in advance!!! Bruce Whitmore (847) 404-5092 (mobile) <mailto:bwhitm...@sbcglobal.net> bwhitm...@sbcglobal.net
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