Welcome to Carver Yachts Owners Forum

We are a boating forum for owners of Carver Yachts to enthusiastically discuss all aspects of Carver Boat ownership. Whether you are looking for your first Carver or currently own one, you are sure to feel at home on CarverYachtOwners.com

You are currently viewing our board as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to searching the forum topics, post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Rule 3700 sump bilge air lock

Discussion of AC's, plumbing and sanitation related issues.
User avatar

Topic author
Scurvy Dog
Scurvy Dog
Posts: 4
Joined: January 5th, 2015, 6:36 pm
Vessel Info: 2000 Carver 530 Voyager
Been thanked: 1 time

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

User avatar

United States of America
CYO Moderator
CYO Moderator
Posts: 2133
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 44 times
Been thanked: 331 times

Re: Rule 3700 sump bilge air lock

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

How about raising the switch?
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
Past - 1988 2807, 1989 4207 Aft
User avatar

Posts: 657
Joined: July 29th, 2013, 11:35 pm
Vessel Info: 2000 Carver 506
Location: Georgian Bay
Has thanked: 124 times
Been thanked: 134 times

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.
2000 Carver 506
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
User avatar

United States of America
Scurvy Dog
Scurvy Dog
Posts: 5
Joined: October 23rd, 2014, 10:37 am
Vessel Info: 2000 Carver Voyager 530
Has thanked: 3 times
Been thanked: 7 times

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.

2000 Carver Voyager 530
Grafton, Il

Return to “AC/Heat, Plumbing & Sanitation”

Who is online

Users browsing this forum: No registered users and 5 guests