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    mackrossi's Avatar
    mackrossi Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Mar 17, 2011, 05:45 PM
    When I fill my bathtub, my toilet runs?
    For some reason, that I don't understand, when I fill my bathtub my toilet starts to run. Why? What can I do to fix it?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Mar 17, 2011, 06:11 PM

    What kind of pressure do you have in the house. Good pressure at all fuacets, or does the pressure drop dramatically when two or more fixtures are open?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    Mar 17, 2011, 08:26 PM

    You have a touchy toilet fill valve and the change in pressure when filling the tub is tripping the valve. It would cost $10 to replace or $0 to ignore
    mackrossi's Avatar
    mackrossi Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Mar 17, 2011, 11:51 PM
    Comment on ballengerb1's post
    I thought that the fill valve was dependent on the ball float, and as such, couldn't be affected by pressure differentials. I suppose it wouldn't hurt to replace it anyhow.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #5

    Mar 18, 2011, 03:21 PM

    Normally they do depend on the float, but yours is apparently malfunctioning and pressure difference is causing it to run. Pop a new one in and you should be all set. Let us know okay?
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