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Old 24 July 2012, 16:31   #1
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Bilge pumps

A long time ago I ran a search for bilge pumps on multiple forums, along with google, and didn't find much related to SIB's. The past couple of days I built a mount and sock so to speak for a small 500gph Whale Pump. The floor clearance is tight, and the auto bilge switch I am afraid will slam into the floor. The pump will stay where it is, but I am thinking of putting the bilge pump switch onto the center keel. I have an on/off/auto bilge pump switch.

Also instead of putting a hole in the floor, I am considering putting the outlet tube from the pump thru the transom in place of one of the scuppers since they don't do anything but leak, and yes I have the plugs.

Has anyone done something similar with a SIB?

Before anyone asks why I would do such a stupid thing, the reason is because under the deck can hold 5 gallons of water that weighs over 40 lbs. When trying to drag it back up the beach to the trailer it is too heavy, so every pound lost is important. Look at my avatar for reference. The rear drains suck!

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Old 24 July 2012, 23:56   #2
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Outlet below the waterline? I don't think that'll work. The pump does not act as a one way valve. It'll probably pump out OK, but will allow water back in when off.

You can run an outlet hose out and up; that should work. OTOH, you're going to need to get the wires up to the battery anyway, which I assume means a hole through the floor anyway?

jky
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Old 25 July 2012, 01:34   #3
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Why would you need a bilge pump in a sib ?
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Old 25 July 2012, 02:03   #4
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Quote:
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Why would you need a bilge pump in a sib ?
See my quote below from my first post.
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Originally Posted by Peter_C View Post
Before anyone asks why I would do such a stupid thing, the reason is because under the deck can hold 5 gallons of water that weighs over 40 lbs. When trying to drag it back up the beach to the trailer it is too heavy, so every pound lost is important. Look at my avatar for reference. The rear drains suck!
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Outlet below the waterline? I don't think that'll work. The pump does not act as a one way valve. It'll probably pump out OK, but will allow water back in when off.

You can run an outlet hose out and up; that should work. OTOH, you're going to need to get the wires up to the battery anyway, which I assume means a hole through the floor anyway?

jky
I was thinking the outlet would run up just higher than the transom before it dumps. Wasn't planning on a check valve. That little bit of water can drain back. The wires could easily be run right behind the rear deck mounting plate on the transom, by running a router for about 2 inches across the transom vertically (Maybe 1/4" deep and a 1/4" wide). See my photo for the aluminum piece on the transom I am talking about running the wires behind. Another reason for having everything not run thru the rear floor decking is then the rear deck can be quickly removed without having to disconnect or cut anything. Plus it would be two less holes in the deck.
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Old 26 July 2012, 11:19   #5
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Holes in the deck aren't a big deal; I would think a 1" bore wouldn't compromise much. But the disconnecting part is a good call.

I wouldn't bother trying to hide the wires; if the Whale is a "normal" bilge pump, you'll likely be replacing it in a couple/few years anyway.

jky
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Old 26 July 2012, 12:09   #6
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I'd put a mini elephant trunk on the little one way floor valve. As you drag it up the beach the subfloor area will drain (faster than the pump probably). Since the drain is centered, pull up the trunk underway so it doesn't hit the prop.
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Old 27 July 2012, 03:51   #7
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I'd put a mini elephant trunk on the little one way floor valve. As you drag it up the beach the subfloor area will drain (faster than the pump probably). Since the drain is centered, pull up the trunk underway so it doesn't hit the prop.
There is a larger 3" elephant trunk on the starboard side (See left side of photo), that I just put in. Happy to say it is so far not leaking either. It is designed to drain the deck of the boat though, and the part I want drained is below that level.

I want it drained before we ever try to lift the bow of the boat. Last time it took a wave over the stern and it was hard to get the wheels back under it. The true solution is simply to get a bilge pump working. It is light and functional.

At this point I am pretty well set on putting the drain hose out thru the port side scupper hole, and running it to the top of the transom before draining. Just need to figure out how to make a 3/4" fitting, fit into an 1 1/4" hole?? With the bilge pump wires and tubing not connected to the aft deck, I can tear the boat down and reassemble it fairly quickly. If the pump ever needs replacement it would be a fairly simple job.

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Old 27 July 2012, 04:34   #8
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On our Futura we had a hole drilled through the aluminium deck centred about an inch to the right of where your tape measure is and a standard (Rule from memory) bilge pump just fitted inside vertically (gently pushed down against the fabric with bungee cord attached to the deck).

This worked very well to empty rain water out when towing/ in a harbour well inside the speed limited area and so unable to plane/ when recovering to reduce the massive extra weight under the deck!
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Old 29 July 2012, 03:22   #9
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Thanks BumbleAbout for understanding where I am coming from. Not sure I understand how you used bungee cord to hold the pump down? I originally bought a Rule 500 (Anyone in the USA want to buy it?), but didn't like how close it was from the bottom floor to the deck. So I purchased the Whale Pump that is much lower in height.

I had to put the boat back together today in order to use it. No way do I want anything attached to the deck that doesn't unclip without tools. So nothing can pass thru the deck.

After taking a wave over the stern parked on the beach I really wished I had completed the bilge project. The elephant trunk worked to drain some of it once I got it off the beach, and back underway. It left gallons of water under the deck that drained after putting it back on the trailer which it got drug up onto, due to surge. Might try to work on that project for a little while tomorrow.

Also almost lost my vehicle into the Pacific ocean today, like in the youtube video's. My gal wanted to drop the trailer in the water. So both gals head over to work the trailer into the water. They were struggling, but I left them alone to figure it out. When the wave washed over the stern, I quickly got the boat off the beach, and sat offshore watching them struggle, but again letting them figure it out, as they are both smart but stubborn, and sometimes learning comes the hard way. One of the Coastie's then feeling bad offered to help. He jumped in the drivers seat, and with a few directions how to drive a Prius, backed the boat trailer like a pro into the water. Then he stepped out of the vehicle with the backup lights still on which meant it was still in reverse I was yelling it was still in reverse, but it took about 20 seconds before the park button was finally pushed

So how close was I to loosing my car? When we got home, I had my gal get in the car and put it in reverse and set the parking brake in our driveway. The car rolled backwards. Try as she might she couldn't set the brake hard enough to keep it from rolling while in reverse. Toyota in their infinite wisdom used drum brakes which don't hold in reverse very well, ever The only saving reason was the Coastie was a BIG guy and pushed the parking brake hard, thank goodness.

Cheers to the Coastie's for being so nice and helpful Just glad nothing happened, but it scared the crap out of me.
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Old 29 July 2012, 05:54   #10
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put non return valve in and you be fine
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