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!

Marine Air unit loses prime

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

Topic author United States of America
Scurvy Dog
Scurvy Dog
Posts: 4
Joined: July 11th, 2014, 3:10 pm
Vessel Info: 1991 Carver 38 ft Aft Cabin

Marine Air unit loses prime

Postby bikeboybob » July 11th, 2014, 3:31 pm

Some of the time when I go for a cruise, the Marine Air unit loses its prime. I can prime it with a hose connected to water at the dock. It tends to lose prime when cruising above 12 knots. Does anyone know what might be causing this.

User avatar

United States of America
Deck Hand
Deck Hand
Posts: 91
Joined: February 8th, 2013, 5:49 pm
Vessel Info: Carver 396
Location: Lake Michigan
Has thanked: 5 times
Been thanked: 31 times

Re: Marine Air unit loses prime

Postby DanM » July 11th, 2014, 4:38 pm

It might be a issue with air seeping into the system when throttling up and going bow high taking the intake out of the water or at least introducing turbulent water/air into it. That could be caused by a change in weight placement (bodies, fuel, water etc.). It that is not the case it is not uncommon that a pumps impeller has blocked water flow or starts to wear down.

You can do a few things. Make sure the intake is always in the clear water flow, the strainer and hose are clear from slime and debris. If that doesn't fix it you can put a bleeder valve just before the pump intake. If when you bleed the line it fixes the problem you probably have a failing pump or pump impeller which will need to be replaced (easy project). You also could have a scale filled cooling line in the AC unit itself but this is less likely.

Carver 396
SugarSand Tango
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: 139 times

Re: Marine Air unit loses prime

Postby Lyndon670 » July 12th, 2014, 6:27 pm

Another trick is to add a longer hose from the thru hull to the strainer/pump. Put a bend in it above the pump but still below the waterline. That way the pump will always keep it's prime.
2000 Carver 506
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario

Return to “AC/Heat, Plumbing & Sanitation”

Who is online

Users browsing this forum: No registered users and 5 guests