SX/SXi/SXi Pro check valve / blackflow preventer

[wright2383]

do you guys use check valves or back flow preventers on your bilge setups? i used one on my last bilge set up on my old x2, and i was wondering if anyone else used them to keep water from flowing back in the bilge line, and what kind you guys used.

 

[wright2383]

nobody??!! i guess im the only one that knows that when your bilge fitting is underwater that the water will travel down your bilge tube and into your hull??

 

[OCD Solutions]

This was brought up before and I'm pretty sure there was no real response to it then as well. I submerge my outlets all the time and don't get any water coming back in so I always thought the pumps had one built in or by design it just isn't a problem.

 

[wright2383]

rule and attwood pumps will flow right back into the hull. on my old x2 the previous owner had installed the hull's bilge fitting right at the waterline, so when it was just floating it would take on water until i installed the back flow preventer. i had a hard time finding decent priced ones for marine use, and on the x2 i had used one from a plumbing store. i eventually found some i think will work but i wont know till they get to me. i was just wondering if anyone else had used them and what kind they used

 

[Dustin Mustangs]

You can also route the bilge line up above the water line before it goes back down to the pump. It doesn't matter if the fitting is below the water line, it matters if the high point in the system is. I think what's going on here is most put these fittings well above the water line so it's never an issue.

 

[WaveDemon]

is this a serious question?

when is your ski's through hull fitting lower than the water line and your bilge pump is off?

 

[Dustin Mustangs]

on my old x2 the previous owner had installed the hull's bilge fitting right at the waterline, so when it was just floating it would take on water until i installed the back flow preventer.

:highhorse:

 

[tipafew]

is this a serious question?

when is your ski's through hull fitting lower than the water line and your bilge pump is off?

Seriously, how low are you mounting your bilge fittings?
I guess if they are crazy low, you could just loop the hose up higher to prevent any back flow.

I don't think anyone has a problem with backflow though.

 

[X2Pilot]

rule and attwood pumps will flow right back into the hull. on my old x2 the previous owner had installed the hull's bilge fitting right at the waterline, so when it was just floating it would take on water until i installed the back flow preventer. i had a hard time finding decent priced ones for marine use, and on the x2 i had used one from a plumbing store. i eventually found some i think will work but i wont know till they get to me. i was just wondering if anyone else had used them and what kind they used

can you post a pic of where the outlet is at on the ski?

 

[wright2383]

sold the ski last saturday. got a 750sx now. dont have pics of the old ski

 

[showmepro1200]

Ok no pic - describe it - did you put the bilge outlet below the bond line??

 

[showmepro1200]

:dunno:

 

[showmepro1200]

Guess the answer is obvious.

 

[wright2383]

i didnt install the bilge fitting. it was already on the ski when i bought it. i may have been an inch or two above the bond line. with small waves the bilge fitting would be under water. i put a check valve in line and it fixed the problem. i was just wondering if anyone else had done this and what kind of valve was used. from everyones posts it seems like this isnt common. when i drill the hull on the new ski i will put it higher, and run the bilge hoses even higher this time.

 

[adz750sx]

Hi,

I fitted one to mine. The bilge outlet was already on the ski when i bought it. Its one inch above the bond line. Had an issue with the engine in the middle of my local lake, by the time i got half way to the beach swimming it back the bilge fitting was under, then it just filled up!

Luckily i dont think my hull could fully sink, by the time i was back at the beach only the back end was sticking out by 3 inches and the engine bay was full. It stabilised just under the water line. Hate to think what would have happened if i had been in the sea:shocked:

So i fitted check valve in line from a local aquarium shop and not had any issues since. :woot:

 

[GReenANt]

I have been looking at doing something like this because when i sit or kneel in the tray and float my outlet is below the water and the hose is not long enough to loop high up.

i usually avoid sitting that way so its not normally a problem but i keep my bilge off since it squeals when it runs dry. I would buy a longer hose but i think a valve would be more effective.

 

[WaveDemon]

I have been looking at doing something like this because when i sit or kneel in the tray and float my outlet is below the water and the hose is not long enough to loop high up.

i usually avoid sitting that way so its not normally a problem but i keep my bilge off since it squeals when it runs dry. I would buy a longer hose but i think a valve would be more effective.

Why not just let the bilge pump take care of it? No modification needed.

 

[wright2383]

why not install a 15$ backflow preventer that takes 10 min to install and have the extra protection? what if your bilge dies? what if your battery dies?

 

[GReenANt]

why not install a 15$ backflow preventer that takes 10 min to install and have the extra protection? what if your bilge dies? what if your battery dies?

I do want it fixed but it only happens when i sit on it so it floats fine on it's own. I just haven't looked very hard for one any suggestions?

i ride on a lake so if my bilge dies i will just use the siphon bilge till i fix it and i only run it as needed with a new battery so no worries there.

 

[GReenANt]

Why not just let the bilge pump take care of it? No modification needed.

i have been i just don't like running my bilge unnecessarily since its on its last leg plus i don't want to have to have to rely on it. (even after i replace it)