Sounds like you need a new joker valve. Or maybe something is stuck in it. Mine can let a little back, but if we see bubbles we just wiggle the handle till it stops. (seals) Also, you shouldn't get more than a hosefull back, as the discharge to the holding tank should be into the top, so, unless it was completely full, there should not be anything to come back but what was in the hose. Also check your vent to see if it is plugged. That would turn your holding tank into a pressurized tank.
Bill Coleman C&C 39 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of OldSteveH Sent: Thursday, September 13, 2012 12:00 AM To: [email protected] Subject: Stus-List Head Trouble I've had this disgusting problem a few times and attributed it to someone over-flushing the head, but I think there's a problem with the head: After a few days post-pump-out the head has back filled with blackwater while sailing and once while at anchor. First few times this happened I chalked it up to a guest over-flushing, got it pumped and went on my way. The Jabsco head is 3 years old. The system was completely redone by previous owner. It was a very well done job, no mickey mouse stuff on the surface, all new hoses and recommissioned blackwater tank. I checked the Jabsco manual and all appears to be piped correctly. The last trip was the last straw. I had to go below every 10 minutes and scoop some very disgusting water out of the bowl and pour down sink drain otherwise it would have overflowed. After a couple of hours of this the shine wears off, believe me. So - my plan is to take out the pump/valve assembly and look for a failed seal. Should the head discharge hose-to-tank have a check valve in it? I think not because it would become fouled with solids. I'm aware of principles of siphoning but short of drawing a diagram I don't think siphoning is the problem. I can't think of anything besides a failed seal. Help! Steve Hood S/V Diamond Girl C&C 34 Lions Head ON _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected] _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]
