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My fluidmaster pump in my toilet opens up sometimes when I open the water in my bathroom sink.

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Do you mean fluidmaster valve? And wha tdo you mean by opens up? Does the water flow into the toilet or something? –  Ethereal Feb 27 '14 at 14:27
Yes it is the fluidmaster valve yes it opens up and some water flow into the toilet like the water in the thank is getting low. –  surcol Mar 2 '14 at 0:20
I'm stumped. Opening your sink faucet will cause a slight drop in pressure at the fluidmaster valve water inlet, but I can't imagine why that would cause it to expel water. If you don't receive a good suggestion I would replace the fill valve since they are relatively cheap. –  Ethereal Mar 3 '14 at 13:54

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