Yup, your first thought is right; you need to install an anti-siphon valve. Had something similar happen to me at the dock on one boat. Floorboards started floating...and right in the middle of dinner, too.
Andy C&C 40 Peregrine Andrew Burton 61 W Narragansett Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ +401 965-5260 > On Jun 1, 2017, at 09:26, Joe Boyle via CnC-List <cnc-list@cnc-list.com> > wrote: > > We had a nasty scare last night after our Wednesday night race. We were > motoring back to the dock - about a half hour trip and I climbed down the > companionway into about 2 inches of bay water. The bilge was full and > overflowing as we motored along. Inspection revealed no leaks that i could > see from the engine compartment - shaft log, water pump, muffler and exhaust > and thru hulls were all fine. I jump up to the head and check all 3 thru > hulls there - all dry. > > We finally get the auto bilge pump working and pumped all the water out - and > no more leak. I believe that the float switch may have been stuck. > > So here's my theory - under power the 30 MK1 tends to squat and the bilge > outlet is below the water on the stern. We had had rain the week before and > I had neglected to turn on the manual switch to get out the last of any water > in the bilge - the float switch always leaves a few cupfuls in the bilge. I > am thinking that while under way with the outlet submerged, the bilge pump > cycled on. Then - as usual - the remaining water in the hose flowed back > into the bilge. But this time with the outlet underwater, it started water > siphoning into the boat. > > After cleaning it all up I checked it in the morning - and it was dry as > usual. The bilge hose has a high loop in it but no air break or check > valve. > > I am thinking a check valve or an air break would keep this from happening > again - any opinions would be welcome. > > Oh - and I think I will fix the manual bilge pump that I have been putting > off for a while! > > thanks, > > Joe > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
