Most likely cause is a tiny leak somewhere, but the water pump may require a rebuild kit. If the diaphragm fails, pressure can leak backwards into the tank, causing this momentary on-off situation.
Once you take the pump section apart, you may find that a tiny piece of debris is the cause.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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