posted 12-26-2010 10:31 AM ET (US)
On your electrical problem:A circuit breaker in a branch circuit controlling a sump pump should not open during normal operation of the sump pump. Your conditions are abnormal, and you need to investigate the cause of the problem.
The sump pump may be faulty and drawing too much current. This typically occurs if the pump is stalled. Give us more information about the rated current drawn by the sump pump and the rating of the circuit breaker that is tripping.
The circuit breaker may be faulty and could be tripping at a current that is lower than its rating.
There could be other loads on the circuit which are creating additional current in the branch circuit, causing the circuit breaker to trip. The wiring to a sump pump should be insulated and protected so that it can operate when the sump area is filled with water, however, it may be possible that there is a problem in the wiring which is creating an additional load. If this is the case, you want to investigate this immediately because any leakage of battery positive current into the water will create galvanic corrosion, which will shortly become a much more serious problem than the sump pump circuit breaker tripping.
On your terminology:
A Boston Whaler boat hull does not have a bilge, and it is not correct to refer to the various molded sump areas in the hull as a bilge space. A Boston Whaler hull is a double-bottom hull, and the area between the inner and outer hulls is filled with foam. There is no access to this area, and there is no free space in this area for water to collect. In other boat hulls this area would properly be called the bilge area, but not in a Boston Whaler boat.
Your boat likely has a cockpit sump, which is a low area designed to collect water that drains into it from the cockpit. This sump typically has a drain through the hull bottom to the sea. It is also typical that a sump pump is located there to pump water overboard, and the pump may be operated by a float switch or other automatic mechanism.
Your boat also likely has an engine splash well, an area designed to collect water that has splashed over the transom and drain it back to the sea. I believe this is what you intended to indicate when you referred to the engine "bin."
The area where the anchor stows is usually referred to as an anchor locker, not as a "cubby."
On Boston Whaler hull design:
Boston Whaler hulls with internal fuel tanks have those tanks located in a fuel tank cavity, typically on centerline and in the cockpit area. These cavities can collect water if the level of water in the cockpit rises and overflows the cockpit sump. Once water flows into the fuel tank cavity there is typically no easy way to remove it, other than by evaporation. For more discussion on the design of the fuel tank cavity on your particular boat, you should begin a new discussion in a REPAIRS/MODS discussion, as that topic is not related to small boat electrical systems.
On the drains in a Boston Whaler hull:
Consult your owner's manual for advice on how to manage the drains in your Boston Whaler boat. In particular, the cockpit sump drain is often recommended to be left open if the boat is left unattended and outdoors for long periods of time. In this way, any rain water that collects in the cockpit will be drained overboard.