Speedboats usually have a bilge pump installed under the floorboards where water seeks the lowest part of the boat, which is standard. When the boat is being moved, water flows from the middle part of the boat to the aft and can leave the hard part with lots of water. 

The weight of water also takes a toll on your fuel. An additional bilge rule pump should be installed in this area. For medium-sized boats, pumps with capacities ranging from 1500 to 2000 gallons per hour should be used. 

Blige Rule Pump

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Of course, we are assuming that the architecture of the boat does not trap some water except for the stern. Otherwise, you will have to install another pump in that damaged area. The bilge pump must be set to shut down automatically after the water reaches the float switch level. 

You can install a light indicator in your dashboard console so that you know every time your pump is off. In this way, you will become quite familiar with how often the pump works regularly. This is a good reason, then, to be concerned when the bilge pump stops more often than necessary. 

This would mean that something is not working properly due to which the water level is rising more than normal. For added protection, you can also install a back-up pump, perhaps with a much higher capacity (3000 to 3500 gallons per minute), and mount its float switch more than the first pump's switch.