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Discussion Starter · #1 ·
Hi-

I'm finishing my basement and just installed a toilet and a sink in my bathroom. The sink works fine, but the toilet won't fill with water unless I turn the shower on upstairs! To connect the toilet to the water supply, I removed an elbow joint in the existing shower line and put in a T joint, sending some water up to the shower and some down to the toilet. Now, however, the toilet won't fill up until I turn the shower on. I thought that perhaps the pressure-balance valve of the shower was installed incorrectly, but after breaking the tile in the shower it appears to have been properly installed.

Any idea why there is a vacuum in the line unless I open the shower valve? Any help would be greatly appreciated.
 

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You need to tie in to the cold water. You tie in to the shower after the valve that goes to the head. To check turn the shower on to the hot side and go to the water closet and see if the tank is getting hot water to it when it filling. If it is you tie in to the wrong spot.
 

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I hooked up a shower valve one time and only had the cold connected and under pressure. I turn on the cold to check for leaks and nothing comes out.
Pulled it all apart to see if there was supply and it works fine, hook it back up and nothing.
Once I connected up both hot and cold it worked fine. The balancing valve was doing it's job.
 

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I do hope you took a few pictures of the rough plumbing before the walls were drywalled---

This is a curious turn of events.
 

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Discussion Starter · #9 ·
Thanks for the suggestions, everyone. I didn't take pictures before drywalling (unfortunately).

I don't believe I tapped into the shower after the valve - I tapped into the line in the basement and I could (at the time) trace the pipe back to the main incoming line - but I wish I had pictures to verify.

Is there any chance that the balancing valve is broken somehow and that is causing a vacuum? Before I installed the toilet, the shower took a long time to warm up and then would get scalding instantly (if you had it turned up too high). I always thought it was just poor insulation in the pipes.
 

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The statement "I dont believe" speaks volumes, as does your UserID. Did you make a sketch of your system with lines labeled and sized before you started cutting and pasting????

Plumbing 101?

:whistling2::whistling2::whistling2:
 

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Sounds like the toilet valve is faulty. Maybe it only works with the reduced pressure.
Shut off the toilet---drain the tank----unscrew the hose from the tank

Stick it in a bucket and turn on the water---have someone turn on the shower and see what happens----------
 

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^^ This. Make sure someone's holding the line in the bucket unless you have a need for a sprinkler in your bathroom.

An easier thing you can do that will tell you the same thing...go up to your bathroom and put your ear near the shower head (make sure the shower has recently been run but is now off), have someone downstairs flush the toilet, listen for gurggling or air sucking into the shower head.

There's nothing creating a vacuum here (nothing in the plumbing anyway) all supply pipes are under pressue unless there is a valve that is off somewhere.
 

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When DIY started to do plumbing. Everyone on here think they are plumbers. And can tell you how to do it but 3/4 of them don't have a clue.
_Basic_ plumbing is not hard...knowing basic plumbing doesn't make you a plumber any more than knowing how to drive to the grocery store makes you a race car driver. I think most non-plumber DIY folks on this forum know that. Some don't...any they have to turn on their showers to fill their toilets.
 
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