Can any of you wise folks tell me exactly where this is. Is it easily accessible. I read that it is in the engine room behind a bulkhead but can't seem to find. Also what does it look like. Any help greatly appreciated.
That sounds like the loop is installed too low in the boat. Vented loops need to be at least 6-8" above waterline AT MAX HEEL, not just when the boat is at rest. On most sailboats, that puts it 2-3 FEET above the bowl...it's typically mounted on the bulkhead directly above the toilet. See photo. (It shows both discharge and intake loops...you may or may not need both).It is in the engine compartment. On the head wall. You will have to lean over the engine and you will see it about 1/2 to 3/4 of the way up the wall. It is a loop in the head water supply line. I will try and get a picture of mine today when I get to the boat.
Not until/unless it fails, which all solenoid valves do sooner or later (iow, if it ain't broke yet, don't fix it till it does break) When that happens, replace the toilet intake line between the thru-hull and the toilet with a nice shiny one (there's prob'ly a lot of sea water mineral buildup in it anyway) and relocate the vented loop to the head above the toilet. A 3/4" vented loop and a few feet of 3/4" #148 flex pvc hose will cost you a fraction of the price of another solenoid.Do you think I should remove the solenoid valve?
Nooooo..that would be a plumbing nightmare that rivals the worst boat builders' installations (and most of theirs are awful)! Take a look at the drawing on p.7 in the SeaEra owners manual and then do it right!Ok will plug the solenoid, add a barb fitting to extend hose into a loop and put it behind toilet and install just a vent line. Will make sure that the loop/vent is 3' above the waterline behind toilet.