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Rule 3700 sump bilge air lock

Discussion of AC's, plumbing and sanitation related issues.
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enproep
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Rule 3700 sump bilge air lock

Postby enproep » January 5th, 2015, 6:55 pm

Hello: I have a Carver 530 Voyager and have an issue with my sump box bilge pump. It seems to get an airlock and continuously run not sucking up any water. It works fine while at dock or at a very calm anchorage. Basically, while sitting at the dock, the water in the sump box remains low and level, switch is only on with incoming grey water. Nothing to pump unless the float is tripped from incoming grey. Head out to sea, the same amount of low water remaining sloshes indicting more water than is actually there, the float switch turns on the pump, and the pump sucks up water and air until it stops sucking up water for some reason (the air it sucks up creates and airlock possibly?) It then runs continuously without sucking up any water. When we get back to the dock we can take a shower and the sump box fills up and overflows even with the pump running (it's running but not sucking up water). I then disconnect it (cut a power wire) and then reconnect it and it works fine.
Any suggestions?
Thanks in advance, Bob

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Re: Rule 3700 sump bilge air lock

Postby waybomb » January 5th, 2015, 7:20 pm

How about raising the switch?
Thanks
Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
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Lyndon670
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Re: Rule 3700 sump bilge air lock

Postby Lyndon670 » January 5th, 2015, 11:22 pm

Is there not a baffle(s) in it to stop the sloshing? I'm pretty sure mine has opposing baffles.
Lyndon,
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Re: Rule 3700 sump bilge air lock

Postby voyagerfan » May 30th, 2015, 4:04 pm

You can "burp" the pump and release the trapped air by releasing the two hold-down tabs on the side of the pump and tilting the pump slightly while the water in the tank is at least 1/2 way up the pump. The ultimate fix is as suggested by waybomb - raise the float switch position relative to the bottom of the tank. There is a single screw holding that switch to the bottom of the tank that has some play in it.
Thanks,

John
2000 Carver Voyager 530
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