Just remember that the simer bw85 is not ignition protected so you don’t want to mount them in your bilge.
I've installed quite a few systems. Simple to complex. What I have found works the best is
1) 1 1" intake hole on the bottom of the hull in front of the prop using a high speed water pickup
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/257072/displayKey/Marine+Hardware/Ntt/mhi/N/0/Dx/mode+matchallpartial/Nty/1/R/7535/D/mhi/catalog_name/FISCO/partnumber/MHI%23HSWP1.000-B/Ntx/mode+matchpartial+rel+Inactive/act/A01/Ntk/All. (Same as your engine water intake)
2) Run that through a seacock
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/93450/displayKey/Marine+Hardware/Ntt/seacock/N/0/Dx/mode+matchallpartial/Nty/1/R/24055/D/seacock/catalog_name/FISCO/partnumber/MHI%23SEAC1.000-B/Ntx/mode+matchpartial+rel+Inactive/act/A01/Ntk/All (a ball valve that can be mounted to the hull of the boat) this lets you seal the boat off from water if a leak should occur some where in you system.
3) run 1" reinforced hose (I like trident 144 series it is hard to find in 1"
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/12285/Ntt/hose/N/0/Dx/mode+matchallpartial/Nty/1/R/2130/D/hose/catalog_name/FISCO/Ntx/mode+matchpartial+rel+Inactive/act/A01/Ntk/All) to a manifold (I like the new factor mastercraft ones four 1" threaded holes in a nice block of plastic with mounting holes in the block sells for $45 from a dealer)
4) From the manifold to your pumps 1 per bag (reversible type simer's or jabsco, make sure you use the new model 18220-1127 with the silicon impellers)
5) Run the fill empty line to a bottom fitting on the bag. The bags use 3/4 thread and the hose i use is 1" make sure you get the right size fittings elbos work better
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/13763/displayKey/A%26M+Industries/Ntt/pvd/N/0/Dx/mode+matchallpartial/Nty/1/R/3180/D/pvd/catalog_name/FISCO/partnumber/PVD%23TE20-1216/Ntx/mode+matchpartial+rel+Inactive/act/A01/Ntk/All 6) Run a vent line from a top front fitting on the bag.
7) Place a check valve in line on the vent hose (I like the bozeworth guzler model
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/9191/Ntt/bosworth/N/0/Dx/mode+matchallpartial/Nty/1/R/23790/D/bozworth/catalog_name/FISCO/Ntx/mode+matchpartial+rel+Inactive/act/A01/Ntk/All)
8) Run the vent out the side right under the rub rail using a thruhull with a 1" barb
http://www.fisheriessupply.com/online/ln_menu/product.asp/mode/1/product_id/93453/displayKey/Marine+Hardware/Ntt/thruhull/N/4294934120/Ne/6/catalog_name/FISCO/R/24056/act/A01/partnumber/MHI%23THMB1.000S/Ntx/mode+matchpartial+rel+Inactive/Ntk/All.
Use 3M 5200 to seal all thruhull fittings, and Teflon to seal threaded connections
This system will fill and empty though the bottom water intake. You will have to watch your bags and turn the pump off when they are done emptying.
If you want you bags to empty out the side like some factory systems you can y the intake line coming into each pump with check valves in each line. Run the extra leg of the Y out the side through a thruhull. When the pump is reversed the water will be stopped by the check valve in the intake line and forced out the thruhull. When fill the check valve in the empty line will keep air from entering your system.
For wiring the simer draw 20 amps, and the jabsco’s draw 12 amps. I would you some sort of a distribution block off you battery and then fuse each pump at the block. Make sure you are using a big enough gage wire as the amp draw is significant. Here is a good referance
http://www.ancorproducts.com/corp/ancor/Conductor_Sizes_C.html is a good reference for what wire size, remember that your run is the total wire length from the battery to the switch to the pump and back to the battery pos and neg. You can use relay but the switches that come in the box are rated for 25 amps. I always make sure the engine is running and idled up in neutral so that my battery gauge is showing 14v. The pumps run faster and more efficient at higher volts.
(Message edited by masonwakerider on September 11, 2007)
(Message edited by masonwakerider on September 11, 2007)