Join Date: Feb 2010
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Re: Marine Head Issues
When you say that you can't get raw water into the bowl, does the pump feel really stiff, or does the handle move up and down just fine but no water gets pumped? If the problem is the former, you have an obstruction of some sort. Close the raw water thru hull and take off the hose, then pump. If the pump is still stiff (not likely), the hose or the pump itself is clogged. If not, the obstruction is in the thru hull or valve. Open the valve and try unclogging it with a piece of wire (coat-hanger, et cetera). If things flow freely it will seem like a lot of water is coming into the boat, but it will really be just a gallon or two (probably less). If you try sticking the wire into the valve/seacock and it feels like you're just hitting metal, you probably need a new valve/seacock (this happened to my boat; replaced the ball valve and everything was golden). If there is marine growth, or paint, or flotsam clogging the thru hull you should be able to unclog it with the wire.
If the head pump doesn't feel stiff, and no raw water is getting into the tank, the problem is probably the little flapper valve(s) inside the pump. As I recall, these flappers are part of a larger gasket assembly. Rebuild the pump and you'll be golden.
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