Although my primary RV is a travel trailer I also have a old pop up camper I use occasionally. It has a hand pump on the kitchen sink. There is simply a water tote below the sink with a 3/8 flexible line that you put into the tote. You pump up and down on the valve handle mounted behind the sink to pump up water and there is a pipe that shoots the water into the sink basin. It works good for what it is intended for. The problem is that after pumping the water that is still in the line will try and slowly siphon (fall) back down into the tote. You can even watch the pump handle move position as it does this. This causes a suction noise back through the pumps outlet above the sink. This is right next to my head as I'm trying to sleep at night. (it's really a annoying noise) There is no real way to cork off the end of the outlet. What I need is something to put in the line below the sink that will keep the water from trying to fall back down into the tote and therefore no more siphon at the valve. Sorry that I did not explain this well. Does anyone have a solution to stop the hand pump from siphoning back down into the tote below it ?

Sharkbite check valve will work fine. Very low open pressure an high resistance to return. Works with most 1/2" lines including lots of flexible lines. Bring a small piece of the tubing with you so you can make sure it works with your tubing.

Amazon, Home Depot both have 3/8 check valves which will do the job for you.

I don't think you want a check valve, because you do want it to drain back out. Otherwise you'll have a mess on your hands. Our old popup used to make a mess when we'd flip the sink over and fold down the canvas top. We used to put something under the sink before we flipped it over, but it wasn't a great solution.For yours, could you find a black rubber stopper the same size as the faucet opening and plug it up before you go to bed?

I added a check valve... But so long as the faucet outlet is far enough above anything it can suck up it's just a labor issue.Oh and it's not "Siphoning" back it's leaking back via the check vlave in the pump.

wa8yxm wrote:I added a check valve... But so long as the faucet outlet is far enough above anything it can suck up it's just a labor issue.Oh and it's not "Siphoning" back it's leaking back via the check vlave in the pump.If I remember correctly (been 45yrs ago) when my Dad had a slide in TC it used the same type of manual pump.With that type of pump, you must make sure you return the handle back to the prime/store position which if I remember correctly the handle was in the up position.Pulled the handle down would pump water out then you had to return the handle to the up position.. Failure to return handle to up position would result in the same issue the OP has, lost prime. Then you would have to go through repriming the pump..Can't find any instructions on these pumps to look at and verify correct position for storing so OP might wish to try storing in the opposite position they are currently using to see if it stops losing prime.Otherwise might be a bad built in check valve and replacing faucet or adding a check valve may fix it.

anti siphon device ? | Good Sam Community

Caveman_Charlie
Explorer II
Oct 15, 2022
LouLawrence wrote:
I suppose this is an inappropriate or unnecessary suggestion, but couldn't you just replace the manual setup with a simple 12v pump and new faucet?

It's not inappropriate but, the hand system works quite well for the little bit of water used when I use this camper. And,, I keep this pop up for going places with no electricity. I bought it used, cheap. It looks like it must have had some sort of battery system on it at one time but, the whole thing has been removed. It's really just a tent/bed on wheels.

So easy to tow though. I live in SW MN and have a friend that moved to Duluth on the north shore of Lake Superior this year. Beautiful country up there. To visit him, and go camping up there, I need to go through what we call the Twin Cities of Minneapolis/ St.Paul and their suburbs. Plus, It's a 5-6 hour drive for me to get there. I can drag this pop up though the cities at 70-75 mph, get 20 mpg, and not worry about abusing it. It's kinda old school thing and that is fun sometimes too. I use it once, maybe twice, a year. I paid $1000 for it and kinda regret it because either I should have just bought a tent or spent more money and got a better pop up. Oh Well, I had fun with it this year and will again next.
mdcamping
Explorer
Oct 16, 2022
Lots of good suggestions, maybe you can make a block for the the pump handle to prevent the handle from moving or preventing a siphon effect. Sounds like the pump handle is worn/old.. so if the pump handle has a serviceable packing box you might be able to roll in some teflon tape with plummers grease. This might stiffen up the handle. Amazon or a local plumbing wholesaler may have universal valve stem kits also.

Mike

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