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and just lift the switch to test the pump.) An electronic sensor projects a weak micro-electric field which is disrupted in the presence of water. These have no moving parts and in some cases are adjusted not to turn on in the presence of large amounts of oil or gas, saving the environment and you a big fine for polluting. With this type though, if the discharge thru hull fitting is close to the static or heeled water level, you need to put a riser loop that goes 18 in. higher, if possible. (See Diagram 1) Wiring the submersible pump


is critical because, while few pumps actually fail, many electrical connections do. All wires should be kept as high above the bilge as possible and marine quality crimp fittings (automotive crimps are cheaper but you get what you pay for!) and terminal blocks should be used. Use only tinned marine wire and maintain color coding. These pumps should connect directly to the battery by way of a properly rated fuse, mounted in an accessible location, and a 3-way switch. This will give you the ability to leave the boat with the automatic switch active or turn the pump on manually. (See Diagram 2)


Diagram 2


Pumps should connect directly to the battery by way of a properly rated fuse, and a 3-way switch. This gives you the ability to leave the boat with the automatic switch active or turn the pump on manually.


Next time we will write about the


diaphragm electric bilge pump, and then of course there is making sure your batteries are up to the task of “feeding” whatever pump you choose. Happy sailing and a dry bilge.


Jack Wilken has a degree in Technical Oceanography- Fullerton, CA / Ex USCG, Boat builder (Westsail QC & Engineering Manager / Crealock 37-now Pacific Seacraft 37-Production Manager / Pacific 41.


Alex Wilken was born in Costa Rica in


1981 and cruised with family until 2004. He has a degree in Marine Carpentry- Wood Construction Center, SCCC, and 100 ton USCG Masters License. Jack Wilken in 1979 from Seattle in


Yamaha 33 to Martha’s Vineyard / 1983- 2004 French Canals to Mediterranean and Western Mediterranean in Pretorian 35 & 50’ steel ketch (Galapagos 50). Jack and Alex own Seattle Boat Works jack@seattleboatworks.com.


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THE SPECIFICS • Low Power Consumption • Ultra Quiet • Compact Design • Worldwide Service


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Emerald Harbor Marine Located at Elliott Bay Marina and Canal Boatyard. 206-285-3632 info@emharbor.com www.emharbor.com


48° NORTH, JANUARY 2011 PAGE 73


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