Have you checked the hoses for clogs? That could be a reason for the water not coming in. I've seen barnacles close off the water intake through-hull in at least one case.
If you decide to replace the head, I would highly, highly recommend that you replace all the hoses at the same time. And I would recommend if you replace the hoses that you use Sealand OdorSafe hose for the output hoses... since it is the most resistant to odor permeation.
As for replacement versus rebuilding... if you have the budget, I would recommend going with a Lavac head, rather than just rebuilding this head. The Lavac is far more reliable a unit, and has far fewer problems, since it has far fewer moving parts.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.