Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Re: Bilge questions
The Ultra Pump Switch that I pointed to above (or tried to, until the SN Store hijacked my link - see how Pump in this post is linked to the SN store?) switches on at one level, and stays on, until the water at a slightly lower level. I just edited my post above so that you can now see the URL to which I actually tried to point you.
Another issue that can cause this is to have too long of a run between the vented loop, and the switch. You may be able to shorten this run, and fix the problem that way.
Finally, verify that the vent in your vented loop is actually venting. Insects can build nests in there, and goop can collect in there, in which case you are siphoning water back into the bilge, until the pump kicks on.
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Instructor - Also certified in Marine Electrical Systems