I have installed a new kitchen facuet with adapter for a portable dishwasher. All works fine, but when the dishwasher is connected and the faucet is turned on the facuet leaks under the sink where the water lines and hose sprayer connects to the valve body. Is this facuet bad or do the new style faucets design are not able to handle the back pressure?

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The facuet leaks under the sink where the water lines and hose sprayer connects

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Ya got to be more specific then that! Does it leak at the water pipe connections or the spray hose connection? Is it a pressure leak spraying out water or is it a drip? What's the brand of the faucet? Single handle? Answer me and I'll answer you. Cheers. Tom

the facuet leaks under the sink where the water lines and hose sprayer connects to the valve body - where the hot, cold and hose sprayer lines enter the bottom of the valve body, whe these lines go up through the center hole in the sink in to the bottom of the valve body.

More of a constant drip stream

Delta ( 400-DST)

Single handle

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the facuet leaks under the sink where the water lines and hose sprayer connects to the valve body

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Then it's NOT leaking from any connection but leaking out of the valve body itself. A internal leak. *If that's the case take the faucet back and have it replaced under warranty . Good luck, Tom