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    brucelaidlaw's Avatar
    brucelaidlaw Posts: 1, Reputation: 1
    New Member
     
    #1

    May 25, 2010, 10:26 PM
    Gravity rainwater tank won't fill cistern
    I have a Fluidmaster (400UK) ballcock in my cistern. I want to use a rainwater tank to fill it just using gravity. The tank's 3 or 4 feet higher but the water won't run in. I've read in this question (https://www.askmehelpdesk.com/plumbing/toilet-cistern-slow-fill-350059.html) details on how to replace the washer, and I've taken mine apart. But there seems to be a very small pinhole for the water inlet. If I make the hole in the washer bigger then it won't shut off when the float rises? Any ideas? Thanks
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #2

    May 26, 2010, 04:31 AM

    Do u get water with to cap of ballcock removed?

    My guess is that u have sediment from rain water clogging line.

    Are u filtering water between rain tank and toilet? If add filter to system, may solve problem.

    Good luck

    Chuck
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #3

    May 26, 2010, 06:04 AM

    I want to use a rainwater tank to fill it just using gravity. The tank's 3 or 4 feet higher but the water won't run in
    Even at 4 feet elevation your head pressure's only 1 3/4 PSI. Ballcocks are designed for a higher pressure and if you open up the hole in the washer all you're going to do is destroy the washer. Tie the ballcock into house pressure. Good luck, Tom
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #4

    May 26, 2010, 01:20 PM

    Hi Tom

    Thanks for getting me straight.

    Chuck

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