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post #11 of 15 Old 08-20-2013
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Re: Bilge questions

Is your discharge hose much higher then the pump...?
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post #12 of 15 Old 08-20-2013
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Re: Bilge questions

IMHO I would not suggest installing a back flow or check valve. I would suggest that you put in a riser loop the shortest distance from the pump and bring it above the level of discharge, that will minimize the amount of water coming back into the bilge. It will also help prevent any siphoning back thru the thru hull depending on its location.
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post #13 of 15 Old 08-20-2013
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Re: Bilge questions

Downsizing the hose diameter decreases the volume of bilge water the bilge pump can pump. Rerouting the hose to minimize drainage and setting the float switch on a higher elevation than the bilge pump is one of several solutions.

Riser loops should be installed at an elevation higher than the waterline with the vessel heeled to prevent siphoning.

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post #14 of 15 Old 08-20-2013 Thread Starter
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Re: Bilge questions

Thanks all.. the input is helpful. I was wondering about the fining. I am just back from a week away where my pump faithfully handled the higher than normal rainfall. So there is sheen :-( I now have the sheets and they are down in the bilge. The water level after the pump works is quite low, maybe an inch left in back one half of bilge. The pump is separate from the switch. They are about 6" apart but in different bilge compartments. I have one hose running to the thru hull which is at least a foot above water line on starboard aft quarter. This line is dedicated to the bilge pump and not connected to cockpit scupper thru hulls. But there is a manual bilge pump which is accessed from the cockpit and ties in to same hose as is used by bilge pump. Does that make sense? If after running the automatic pump, I also give the manual about 5 more pumps, the water level drops to near zero turning off the bilge pump switch at least until it rains heavily again.

The thought of lifting the bilge pump switch is intriguing. The problem does lie in a hose that retains a significant amount of bilge "water" letting it run back in. SO if I can reposition the switch do I raise or lower it? :-)

Also, in terms of the soaking pads, I just crammed a bunch of them down in what water was left in the bilge. They have soaked overnight. DO I now fish them out for proper disposal or just leave pads down in there? I do want to get back to my nice clean bilge which is what I had before I stupidly missed the filling port when changing oil on my A4. Wont make that mistake again.
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post #15 of 15 Old 08-20-2013
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Re: Bilge questions

Good question about higher or lower.
If you mount it lower you could damage the pump because it will continue to run after you lose suction.
If you mount it higher, the water will still run down after the pump shuts off, but it will be at a higher level than before.
You could leave it alone and just use the on/off/automatic switch to suck the last of the water out.

I had heard the older wooden boat sailors say a dry bilge is the sign of a sick mind.

As part of my refit I mounted my new bilge pump and float switch on a lead plate so i can lift the pump and switch assembly out for servicing. I recently tried one of the new non-float switch automatic types but it kept me awake because it comes on and test runs every five minutes.

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