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Old 05-15-2016, 11:29 AM   #1
Senior Member
City: Houston, TX
Country: USA
Vessel Name: Good Vibrations
Vessel Model: Grand Banks Classic 42
Join Date: May 2013
Posts: 128
# bilge pumps & hi level alarms on gb 42?

Is there a specified # of bilge pumps recommended for a Grand Banks 42 ft? The one I bought only has a single Rule 2000 located forward of engines at compartment bulkhead. That's also where the separate high water level switch for indication (red light at helms) is mounted. This 30-yr old boat also has a second non-functioning bilge pump just forward of engines in main compartment and another non-functioning pump in stern compartment. I'm thinking at least one additional sump pump for redundancy in main compartment and a new pump in stern compartment. Also, I've seen/heard somewhere about having one bilge pump in each of the 3 compartments but can not find details in Grand Banks manuals. I can see the prudence of having at minimum, high level alarms in all 3 compartments. Is there a "best practices" for bilge pumps and level alarms on GB 42s?

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Old 05-15-2016, 01:22 PM   #2
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,189
You can never have too many pumps.
My EggHarbor came OEM with 2 main pumps and one shower pump.
Over the years, I added 3 more pumps. Each pump has its own discharge.
So in the lowest main bilge, one rule 2000, two rule 3700, one 350 shower sump type pump.
In the aft area, one rule 2000, one rule 500 and a sealed bulkhead divides bilge into two sections.

I wired the two rule 3700 with separate water level switches, but both I turn on simultaneously with one switch and two relays.

Basically this, except I used 12 vdc 40 amp cube relays instead of diodes to prevent any voltage drops.
One switch turns on both pumps.
Each pump can independently turn on with its own water level float switch.
The extra pumps are purely 'emergency usage'.

I have them at the same basic level as the original OEM pump. I really ought to raise them a little higher.
One winter with boat in slip, the bilge froze solid. Pumps which are ice locked cant pump water, so if a leak had happened, down the boat would go. There is always some residual water in the bilge, mostly from rain.

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