How to Fix Leaking Toilet Tank Bolts

No matter how comfortable you think your living room furniture may be, or how much you love your favorite old recliner, there is not a single seat in anyone’s home that is more important than the toilet.

If your toilet is leaking from the tank bolts, you want to fix the issue, fast; especially if you only have one bathroom or if several people live in your household.

How to Replace Toilet Tank Bolts


Before getting started, you’ll need to get together the following materials:

  • New brass screws
  • New rubber gasket
  • Screwdriver
  • Wrench
  • 2 flat washers
  • 2 metal nuts
  • Towels or sponges

Do note that when purchasing replacement parts, you can buy them individually, or altogether, as a kit. If you do buy a kit, it will likely come with all the parts you need inside the tank, such as a fill valve, chain, and rubber stopper. But for purposes of only fixing the tank bolts, you only need new screws and a gasket.


Step 1. Shut off the water supply. If you’re a newbie at this, it’s the metal valve right behind the bottom of the toilet bowl.

Step 2. Flush the toilet. You’ll want the tank to be completely empty before you get to work. Use a towel or sponges to soak up the water remaining at the bottom of the tank.

Step 3. Disconnect the water supply. When you look behind the toilet, you’ll see a narrow pipe that supplies water to the tank. Rotate the nut that’s holding it in place counterclockwise.

Step 4. Unscrew the nuts holding the tank to the bowl. Also turn them counterclockwise. Discard the old screws, since you’ll be replacing them with new, brass ones (this type of material won’t rust).

Step 5. Lift the toilet tank. You’ll see a big, round hole in the middle of the back of the bowl, with two smaller holes from where you removed the nuts.

Step 6. Replace the bolts with the new, brass ones. They will be located on the bottom of the tank you just removed. When tightening them, make sure not to overdo it, since doing so may crack the tank.

Step 7. Place the new gasket over the drain valve on the bottom of the tank. You’ll be able to easily place it without the need for any tools. Make sure the plastic is completely covering the edges of the drain valve.

Step 8. Replace the tank to its original position. Tighten the flat washers and the metal nuts on top of each bolt. Just as with the bolts, be careful not to over tighten them to prevent cracks on the tank.

Step 9. Inspect the tank. The porcelain on the tank should be touching the porcelain on the toilet seat. If they aren’t touching, you need to tighten the flat washers and bolts better. Also, wiggle the tank to see if it moves. If it moves at all, the bolts are too loose.

Step 10. Reattach the water supply to the tank. Once safely attached, reopen the water supply and flush the toilet to make sure that everything’s working fine and that there aren’t any more leaks.

Contact Sansone for Plumbing Services in Broward, Palm Beach, and St. Lucie

At Sansone, our plumbing experts are experienced with all types of toilets and plumbing systems. If your toilet is having issues, let us help you!

Call us to hear about our specials or to schedule an appointment.

Broward: (954) 800-2858
Palm Beach: (561) 701-8274
St. Lucie: (772) 879-5656

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