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Ok here is my problem. I have a 2003 SAN that originally had hard tanks and I piggy backed a 400 fat sac on top that was filled via the vent of the hard tank. I always had a problem with once they are 3/4 full the water is pushed back out through the empty pump (rule 1100 aerator). The easy fix is to push a cork into the outside of this hole and remove it when we are ready to drain. But, this completely does away with leveling the boat while riding. I've heard that running the empty hose up higher (more forward) will solve this issue. Is there anything else that needs to happen (anti siphon loop valve or loop). I'm trying not to get into reversible pumps or drilling holes in my boat. Thanks for any help
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You can get a sprinkler/solinoid valve to install on that line that will open automatically when you turn on the aerator pump and close when the pump is not running. -
My experience is that a loop alone in the line will fix it. Make the loop go as high as you can and then drop into the through hull. I think it is a little unusual that the siphoning is happening from your discharge port. It often occurs on the vent. Is the discharge through hull higher than the level of the top of the sack?Comment
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No, the top of the bag almost pushes the compartment open if full. There might be room for one life jacket in there. It's definitely over the thru hole, but the hose that it pushes put comes from the bottom. I think I'll try the loop first. You mean literally just a longer hose that is ran as high and as far up towards the bow as possible before turning around to go out through hole right. The vent has a manual valve on it so once it's full I just close it. A little air from adding a could minutes worth of water here and there to level the boat isn't gunna hurt it, it's all that runs out through the empty that sucksComment
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This sounds like basic physics then. The water will level itself in the hose and sac, so once the sac level gets higher than the hose outlet (thru hole) it will start to empty through it and possibly creates a siphon thereby draining the rest of the ballast
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Fought the same issue as you after putting in 800lb sacs and pulling the hard tanks. Bought sprinkler valves at Home Depot and the barb fittings from Lowes. I put a sprinkler valve on the fill and empty lines. It stopped the siphoning of the bags through the empty line and helm controls are no longer needed on the rear sacs. The rear helm controls simply stay open all the time now. My empty times did slow down some or at least seemed to slow down. The bilge will shoot water about 12-18" out away from the boat. The empty pumps now will not do much more than enough to have it run down the side of the boat. So it solved one problem of the siphoning but slowed down drain times.
I don't think the pumps can put enough pressure on the valve to open it all the way up is my theory. I'm going to take one of them apart and see if there is a way to get them to open with less pressure sometime soon. It works well enough now that they are finished by the time we get back to the ramp, onto the trailer, and packed up to go home. But if it can be better I definitely want it to be.Comment
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On the empty side did you put your valve before or after the pump?Originally posted by slidin_out View PostComment
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After the pump about 6-8". To put it before would have been tough in that small area under the bag in the very aft of the locker.Originally posted by swatguy View Post
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Another solution would be to cross vent your system. Lots of guys on the Tige forum have done this. Run the port discharge hose to the starboard through hull. It gets confusing at first to realize that the port water is coming out the starboard side, but especially once the boat is leaning, it stops the possibility of any siphoning. It costs about 12 feet worth of ballast hose and won't slow down your pump much at all.
I personally think that would work better and cheaper than putting any sort of valve.Comment
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