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how to fix leaky toilet tank

my toilet bowl tank is leaking one drop every 10 min need to know if that can be fixed or do i need to buy a new tank.

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Posted 2013-08-19T13:24:45+0000  by liberty69 liberty69

Howdy Liberty69,


The most common type of toilet, especially in homes, consists of a tank and a bowl, whether in two separate pieces or a single molded unit.

If your toilet has a tank, then there are generally three main culprits that will cause water to run when the toilet is not in use.


  • Problems with the flush valve
  • Problems with the fill valve
  • Loose flush lever assembly





All bowls are unintentionally made slightly different due to how porcelain is manufactured. One bowl may have a low side towards the front of the bowl inlet hole, and another bowl may have a low side towards the back of the bowl inlet hole, or another one may have the low side on one of the sides of the bowl inlet hole. Water will naturally flow to the lowest point. Adding food coloring to the inside of the tank can help you determine where the leak is actually occurring.


Happy Plumbing,

Posted 2013-08-19T18:43:46+0000  by Dave_HD_OC

Thank you for the information..... But looking more closely at the issue I look under the tank and noticed the screws are rusted and the leak is combing from the screw. Are the screws replaceable.

Posted 2013-08-20T13:50:52+0000  by liberty69

Howdy again liberty69,


The good news is YES! you can change out the brass bolts easy. Here is a step by step on how to change them out. No one likes a water leak. They can be costly and wasteful. If your toilet is leaking water from the tank to the bowl, you can replace your Flush Valve. You will have to take the toilet tank apart to do this, but it’s definitely something you can tackle yourself.

    4b9e9ee9-f91f-4df8-8b76-16f2ee4a2317_300.jpg    ecodrake_tankbottom.jpg

 Tools Required: Adjustable Pliers, Adjustable Wrench, Needle Nose Pliers, Flathead Screwdriver
Supplies Required: Tank Bolts, Tank To Bowl Seal, Flush Valve

These instructions are meant for traditional flapper style toilets. For other types of toilets, please follow manufacturer directions for installing the appropriate Flush Valve.

Turn off the water supply to the Toilet. Flush the toilet to remove the water. Hold the handle down to allow the remaining water to drain. Use a sponge or towel to remove the remaining water. Unscrew the Water Supply Line Connecting Nut on the Tank end of the Water Supply Line from the Fill Valve Shank.
Often this Nut can be loosened by hand, however, Adjustable Pliers or an Adjustable Wrench may be required if the Nut has been over tightened. Remove the Nuts and Metal Washers from the Tank Bolts underneath the Toilet Bowl. Carefully remove the Tank from the Toilet Bowl. Continue to completely remove the old Tank Bolts from the Tank bottom.
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Step 2

Remove the old Tank to the Bowl Seal from the Flush Valve Shank (The Black Ring is the Tank to Bowl Seal). Note the orientation of the old Flush Valve in the Tank using the Overflow Tube as a reference.

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Step 3

Remove the Flush Valve Flange Nut from the Flush Valve Shank.

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Step 4

Remove the old Flush Valve and discard.


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Step 5

Insert the new Flush Valve Shank through the hole in Tank bottom. Note: Make sure the new Flush Valve is oriented in the Tank the same as the old Flush Valve. According to the manufacturer’s instructions, place any Gaskets or Seals onto the Flush Valve Shank on the bottom of the Tank.

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Step 6

Screw the new Flush Valve Flange Nut onto the Flush Valve Shank. Do not overtighten to avoid cracking the tank.

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Step 7
Place one Rubber Washer on each Bolt and slide the Washer to the Head. Place the Bolts in the bolt holes in the Tank bottom. On the bottom of the Tank, slide another Rubber Washer on each Bolt up to the Tank, followed by a Flat Washer and then a Hex Nut. Tighten with a Wrench until snug. Do not overtighten.
Place the Tank back on the Toilet Bowl. Install a Metal Flat Washer and Wing or Hex Nut on each Bolt. Tighten each Nut until the Tank is secure. Again, do not overtighten.
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Step 8
After the Tank is installed, reconnect the Water Supply Line to the Fill Valve Shank. Turn on the water supply to the toilet. Inspect the supply line connection for leaks. When the tank fills, inspect for leaks around the bolts.
Finally, attach the Chain to the Flush Arm. Trim any excess chain links leaving one or two links slack. Flush the Toilet. Inspect for leaks between the Tank and Tank Bowl.


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That wasn't too hard, but think of all the time and money you just saved, not to mention the working knowledge of "I did this project".
Happy Plumbing,
Posted 2013-09-16T22:45:04+0000  by Dave_HD_OC
WOW Dave!

What an exceptional answer ... very detailed and right on target.

I'd only like to add one thing to your dialogue.

While tightening your new set of brass tank bolts, be cautious.

Remember, you're placing force on a porcelain tank body ... do not over-tighten!

So, as they begin to become snug, turn one a small amount and then turn the other approximately the same amount.

This will prevent pulling one side tighter than the other, which may crack the tank.

I like using a small dollop of plumbing sealant inside the tank bolt hole before assembling the washers and installing the brass bolts.

Pat InPaint
Posted 2015-12-15T23:31:53+0000  by Pat_HD_ATL
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