Common signs that a gravity-flush toilet tank needs repair include: 1. **Constant Running Water**: If the toilet continues to run after flushing, it may indicate a faulty flapper or fill valve. 2. **Weak Flush**: A weak or incomplete flush can be caused by a clogged rim hole, a malfunctioning flapper, or low water level in the tank. 3. **Leaking Water**: Water pooling around the base of the toilet or dripping from the tank suggests a leak, possibly due to a cracked tank or worn-out seals. 4. **Phantom Flushes**: If the toilet refills randomly without being flushed, it could be due to a slow leak from the tank into the bowl, often caused by a deteriorating flapper. 5. **Noisy Tank**: Unusual noises, such as hissing or gurgling, may indicate issues with the fill valve or a blockage in the water supply line. 6. **Stuck Handle**: A handle that sticks or needs jiggling to stop the water flow may be due to a corroded or misaligned handle mechanism. 7. **Water Level Issues**: If the water level in the tank is too high or too low, it can affect flushing efficiency and may be due to an improperly adjusted float or fill valve. 8. **Cracks in the Tank**: Visible cracks, even if not leaking, can eventually lead to leaks and should be addressed promptly. 9. **Slow Tank Refill**: A tank that takes too long to refill may have a partially closed shut-off valve or a clogged fill valve. 10. **Rust or Corrosion**: Rust or corrosion on metal parts inside the tank can lead to malfunction and should be replaced to prevent further damage.

1. **Inspect the Toilet Tank**: Remove the lid and observe the components inside. Check for visible damage or wear on parts like the flapper, fill valve, and flush valve. 2. **Check the Flapper**: Ensure the flapper is sealing properly. If it’s warped, cracked, or not sealing, it may need replacement. Listen for continuous water running, which indicates a faulty flapper. 3. **Examine the Fill Valve**: Observe the fill valve for proper operation. If the toilet doesn’t refill correctly or the water level is too high/low, the fill valve might be faulty. 4. **Look at the Flush Valve**: Inspect the flush valve for cracks or damage. If the toilet doesn’t flush completely, the flush valve could be the issue. 5. **Inspect the Float**: Ensure the float is not waterlogged or stuck. A malfunctioning float can cause improper water levels. 6. **Check the Chain**: Ensure the chain connecting the flapper to the flush handle is not too loose or too tight, which can prevent proper flushing. 7. **Listen for Leaks**: Listen for any hissing sounds, which can indicate a leak. Use food coloring in the tank to check for leaks into the bowl. 8. **Observe the Handle**: Ensure the handle moves freely and isn’t loose or broken. A faulty handle can prevent proper flushing. 9. **Test the Toilet**: Flush the toilet and observe the operation. Note any issues like weak flush, incomplete flush, or continuous running. 10. **Consult a Professional**: If unsure, consult a plumber for a thorough inspection and accurate diagnosis.

To repair a gravity-flush toilet tank, you will need the following tools: 1. **Adjustable Wrench**: For loosening and tightening nuts and bolts, especially those connecting the tank to the bowl and the water supply line. 2. **Screwdriver**: A flathead or Phillips screwdriver is necessary for removing screws that secure the tank lid or other components. 3. **Pliers**: Useful for gripping and turning small parts, such as the chain connecting the flush handle to the flapper. 4. **Bucket or Towel**: To catch or absorb any water that may spill during the repair process. 5. **Sponge or Cloth**: For cleaning the inside of the tank and drying any wet surfaces. 6. **Replacement Parts**: Depending on the issue, you may need a new flapper, fill valve, flush valve, or tank bolts. Ensure you have the correct parts for your specific toilet model. 7. **Plumber’s Tape**: Also known as Teflon tape, it is used to seal threaded connections to prevent leaks. 8. **Level**: To ensure the tank is properly aligned and level after reassembly. 9. **Utility Knife**: For cutting any excess chain or tubing. 10. **Rubber Gloves**: To protect your hands from dirt and bacteria. 11. **Toilet Tank Repair Kit**: These kits often include a variety of replacement parts and can be a convenient option if multiple components need replacing. Having these tools on hand will help you efficiently address common issues such as leaks, running water, or flushing problems in a gravity-flush toilet tank.

1. **Turn Off Water Supply**: Locate the shut-off valve behind the toilet and turn it clockwise to stop water flow. 2. **Empty the Tank**: Flush the toilet to drain water from the tank. Use a sponge or towel to soak up any remaining water. 3. **Inspect the Flapper**: Remove the tank lid and check the flapper at the bottom. If it's worn or damaged, it may not seal properly. 4. **Replace the Flapper**: Disconnect the chain and remove the old flapper. Install a new one by attaching it to the overflow tube and reconnecting the chain. 5. **Check the Fill Valve**: Ensure the fill valve is functioning correctly. If water continuously flows into the tank, it may need adjustment or replacement. 6. **Adjust the Float**: If the water level is too high, adjust the float. For a ball float, bend the arm downward. For a cup float, slide the float down the rod. 7. **Inspect the Tank Bolts**: Check for leaks around the bolts at the bottom of the tank. Tighten them if necessary, but avoid over-tightening. 8. **Replace Tank Bolts and Gasket**: If tightening doesn't work, drain the tank, remove the bolts, and replace the rubber washers and gasket. 9. **Reassemble and Test**: Reattach all parts, turn on the water supply, and let the tank fill. Check for leaks by observing the tank and floor. 10. **Final Adjustments**: Ensure the flapper seals properly and the fill valve shuts off at the correct water level. Adjust as needed. 11. **Monitor for Leaks**: Keep an eye on the toilet for a few days to ensure the leak is fixed.

1. **Turn Off Water Supply**: Locate the shut-off valve behind the toilet and turn it clockwise to stop the water flow. 2. **Drain the Tank**: Remove the tank lid and flush the toilet to empty the water. Hold the flush lever down to ensure most of the water drains out. Use a sponge or towel to soak up any remaining water. 3. **Remove the Old Flapper**: Detach the chain from the flush lever. Unhook the flapper from the overflow tube by sliding it off the pegs or unhooking it from the ears, depending on the design. 4. **Clean the Valve Seat**: Inspect and clean the valve seat where the flapper seals. Use a cloth or sponge to remove any mineral deposits or debris to ensure a good seal. 5. **Install the New Flapper**: Attach the new flapper to the overflow tube by hooking it onto the pegs or ears. Ensure it is positioned correctly and can move freely. 6. **Attach the Chain**: Connect the chain from the flapper to the flush lever. Adjust the chain length so there is a slight slack when the flapper is closed, preventing it from being too tight or too loose. 7. **Test the Flapper**: Turn the water supply back on by turning the shut-off valve counterclockwise. Allow the tank to fill, then flush the toilet to test the new flapper. Ensure it seals properly and the toilet flushes correctly. 8. **Adjust if Necessary**: If the flapper doesn’t seal or the chain is too tight/loose, make necessary adjustments to ensure proper operation. 9. **Replace the Tank Lid**: Once satisfied with the operation, replace the tank lid.

1. **Remove the Tank Lid**: Carefully take off the lid and set it aside. 2. **Check the Flapper**: Inspect the rubber flapper at the bottom of the tank. Ensure it seals properly over the flush valve. If it's worn or damaged, replace it. 3. **Adjust the Chain**: Ensure the chain connecting the flapper to the flush handle is not too tight or too loose. It should allow the flapper to seal completely. 4. **Inspect the Float**: Check the float (either a ball or a cup) that controls the water level. If it's set too high, water will overflow into the overflow tube. Adjust the float to lower the water level. 5. **Adjust the Fill Valve**: If the float adjustment doesn't work, adjust the fill valve. For a ball float, bend the arm gently downward. For a cup float, use the adjustment screw or clip. 6. **Check the Overflow Tube**: Ensure the water level is about an inch below the top of the overflow tube. If water is spilling into it, adjust the float or fill valve. 7. **Inspect the Fill Valve**: If the fill valve is faulty, it may need cleaning or replacement. Turn off the water supply, remove the valve, and clean any debris. If necessary, replace it. 8. **Turn the Water Back On**: After adjustments, turn the water supply back on and test the toilet. Flush a few times to ensure the problem is resolved. 9. **Replace Parts if Needed**: If issues persist, consider replacing the flapper, fill valve, or entire flush mechanism. 10. **Reattach the Tank Lid**: Once resolved, place the lid back on the tank.

You can purchase replacement parts for a gravity-flush toilet tank at the following places: 1. **Home Improvement Stores**: Major retailers like Home Depot, Lowe's, and Menards offer a wide range of toilet replacement parts. They have in-store experts who can assist you in finding the right parts. 2. **Plumbing Supply Stores**: Specialized plumbing supply stores often carry a comprehensive selection of toilet parts and can provide expert advice. 3. **Online Retailers**: Websites like Amazon, eBay, and Walmart offer a vast selection of toilet tank parts. You can read reviews and compare prices to find the best deals. 4. **Manufacturer's Website**: If you know the brand of your toilet, check the manufacturer's website. Brands like Kohler, American Standard, and Toto often sell replacement parts directly. 5. **Local Hardware Stores**: Smaller, local hardware stores may carry common replacement parts and can offer personalized service. 6. **Specialty Plumbing Websites**: Websites like PlumbingSupply.com and SupplyHouse.com specialize in plumbing parts and can be a good resource for finding specific components. 7. **Second-Hand Stores**: Habitat for Humanity ReStores and other second-hand stores sometimes have surplus or gently used plumbing parts at a discount. 8. **Professional Plumbers**: Hiring a plumber can ensure you get the correct parts and professional installation. They often have access to a wide range of parts through their suppliers. 9. **Big Box Retailers**: Stores like Target and Costco may carry basic toilet repair kits and parts. 10. **Local Classifieds and Marketplaces**: Platforms like Craigslist or Facebook Marketplace can sometimes have individuals selling new or unused parts. Always ensure compatibility with your specific toilet model before purchasing.