Based on what I've read here, I think the problem is with your kitchen sink faucet. Either the lines didn't get attached securely or the body of the faucet has a crack.
Of course this doesn't explain why (a) you can't see it drip, or (b) why the 12 volt pump doesn't activate as the drip releases the water pressure.
Are you using a water pressure limiting device when connected to city water? Maybe your leak is happening at higher-than-normal pressures? (If not, the variation in city water pressure could explain both a and b above.)
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John
Somewhere, USA
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