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"markdown": "[Mountain Man Plumbing / Toilets](<https://mtnmanplumbing.com/services/toilet-repair/?agentnet=md>) Sandy, Utah · Salt Lake Valley\n\nRunning toilet repair\n\n# Find the leak. Stop the refill.\n\nA quiet leak through the tank outlet can make the fill valve cycle all day. A fill valve that fails to shut can send a continuous stream down the overflow. Watching the tank through one refill tells us which path the water is taking.\n\n[Call / text (385) 766-8935](<tel:13857668935>)\n\n- [Toilet repair hub](<https://mtnmanplumbing.com/services/toilet-repair/?agentnet=md>)\n\n- [Running toilet repair](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/?agentnet=md>)\n\n- [Flange & wax ring repair](<https://mtnmanplumbing.com/services/toilet-repair/toilet-flange-wax-ring-repair/?agentnet=md>)\n\n- [Bidet seat installation](<https://mtnmanplumbing.com/services/toilet-repair/bidet-seat-installation/?agentnet=md>)\n\n- [Toilet replacement & installation](<https://mtnmanplumbing.com/services/toilet-repair/toilet-replacement-installation/?agentnet=md>)\n\nInside the toilet / explore in 3D\n\n## Every part has a job.\n\nOpen the tank, follow a flush, then lift the toilet to see its floor seal. Switch on the bidet seat to explore the water connection and wash wand.\n\nKohler Cimarron / elongated\n\nFollow a flush\n\nReady. The tank is full and the bowl holds its standing water seal.\n\nWhole toilet\n\n### A flush from supply to drain.\n\nThe shutoff and supply hose bring in clean water. Tank valves control the flush and refill. The bowl’s built-in trapway leads to the sealed floor connection.\n\n#### What to look for\n\nChoose a part to see what it does and how it relates to a repair.\n\n### Model reference & parts index\n\nThe porcelain toilet and bidet-seat exteriors use Kohler’s K-31648 and K-8298 CAD geometry in inches. The toilet has a 12-inch rough-in and a 16½-inch bowl rim. We built the working tank parts, supply connection and floor assembly for this teaching model. The bowl view traces the water route; colored water makes its movement visible. The flush cycle is shortened for the demonstration.\n\n[Toilet drawing ↗](<https://techcomm.kohler.com/techcomm/pdf/K-31648_spec_US-CA_Kohler_en.pdf>) · [Bidet-seat drawing ↗](<https://techcomm.kohler.com/techcomm/pdf/K-8298_spec_US-CA_Kohler_en.pdf>) · [Bidet operation ↗](<https://techcomm.kohler.com/techcomm/pdf/1441872-5.pdf>)\n\n**Fill valve & cup float**\n\nThe fill valve admits water after a flush. Its float rises with the water and shuts the inlet at the set level. The narrow refill tube also sends water to replenish the bowl.\n\n**Canister flush valve**\n\nThe handle and chain lift this cylinder. Water enters the open outlet around its bottom edge and flows into the bowl. It drops back onto its seal as the tank empties.\n\n**Flush-valve seal**\n\nThis replaceable ring seals the canister against the flush-valve base. It holds the tank’s water between flushes.\n\n**Overflow & bowl-refill tube**\n\nThe center overflow gives excess tank water a route into the bowl. The small refill tube delivers the water that rebuilds the bowl’s standing water seal after a flush.\n\n**Trip lever & chain**\n\nThe outside handle turns an arm inside the tank. A short chain transfers that movement to the canister.\n\n**Tank gasket & tank bolts**\n\nOn this two-piece toilet, the large gasket seals the tank outlet to the bowl. Separate bolt gaskets seal the tank mounting holes.\n\n## Watch where the water goes.\n\nLift the lid carefully and set it somewhere stable. Flush once, then watch the tank as it refills.\n\n### Water reaches the overflow\n\nCheck the marked water level and float movement. An over-adjusted or sticking fill valve can keep adding water after the tank is full.\n\n### Water stays below the overflow, then drops\n\nThe flush outlet is leaking. Check the flapper or canister seal, its seating surface and anything holding it slightly open.\n\n### The handle needs a jiggle\n\nThe lever or chain may be snagging or keeping the seal lifted. The chain needs enough slack for the seal to close and enough travel to lift it on a flush.\n\n### The tank fills slowly or whistles\n\nCheck the supply valve, connector and fill-valve inlet for restricted flow. Sediment in the fill valve is a common service finding.\n\nRead more: [Kohler toilet service-parts guide ↗](<https://resources.kohler.com/webassets/kpna/brochures/Toilet_ServiceParts_Brochure_FINAL.pdf>)\n\n## Match the mechanism inside your tank.\n\nToilets use several flushing systems. The tank’s model number and the existing mechanism are more useful than the color of a replacement package.\n\n### Hinged flapper\n\nA rubber or flexible-plastic flap lifts off the outlet. Its diameter, hinge arrangement and closing behavior need to match the toilet.\n\n### Canister / tower\n\nA cylinder lifts vertically and seals against a replaceable ring. The AquaPiston example in our model uses this arrangement. A worn seal can be serviced without replacing every tank part.\n\n### Dual flush\n\nTwo flush choices operate a matched valve assembly. Button rods, cable mechanisms and seals vary by model.\n\n### Pressure-assisted tank\n\nAn enclosed pressure vessel sits inside the porcelain tank. It uses its own service parts and procedures; identify the system before ordering a rebuild.\n\nRead more: [Kohler toilet service-parts guide ↗](<https://resources.kohler.com/webassets/kpna/brochures/Toilet_ServiceParts_Brochure_FINAL.pdf>)\n\n## The little tube has a big job.\n\nThe refill tube restores the bowl’s water after a flush. A disconnected tube can leave the bowl low even though the tank fills normally. On valves that use an overflow clip, the tube is held above the opening. Pushing its end deep into the overflow can start a siphon and cause repeated filling.\n\n### Bowl water is the gas seal\n\nWater remains in the bowl and its curved trapway between flushes. Correct refill keeps that standing seal at its intended level.\n\n### Set the tank to its marked level\n\nThe water line is part of the toilet’s flush design. Raising it to chase a weak flush wastes water and can send water into the overflow.\n\nRead more: [Fluidmaster refill-tube installation ↗](<https://www.fluidmaster.com/wp-content/uploads/2016/12/400AH-PerforMAX-Fill-valve-English.pdf>)\n\n## A simple test for a silent tank leak.\n\nAdd a few drops of food coloring to the tank. Leave the toilet unflushed for 10 minutes. If color appears in the bowl, water is passing through the tank outlet. Flush the color away afterward. We then inspect the seal, its seat and the linkage to find what is preventing a tight closure.\n\nRead more: [EPA WaterSense: checking toilet leaks ↗](<https://www.epa.gov/watersense/fix-leak-week>)\n\n## Finish the repair with a full cycle.\n\nOnce the part is matched, we isolate the water, replace or service the failed component and set the water level. The final check includes a complete flush, bowl refill, fill-valve shutoff and a quiet period with no falling tank level. We check the supply connector and tank underside for leaks too.\n\nRead more: [Kohler toilet installation instructions ↗](<https://techcomm.kohler.com/techcomm/pdf/1476134-2.pdf>)\n\nGood questions\n\n## A few more answers.\n\n### Should I replace all the parts in the tank at once?\n\nIf the other fittings are sound, replacing the failed seal or valve may be enough. Several aged or deteriorated components can make a matched rebuild more practical. The tank model determines which parts belong together.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/#answer-should-i-replace-all-the-parts-in-the-tank-at-once>)\n\n### Is the dye test useful for a floor leak?\n\nThe dye test checks water escaping from the tank into the bowl. A floor leak is traced separately at the supply, tank connections and floor seal.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/#answer-is-the-dye-test-useful-for-a-floor-leak>)\n\n### Can hard water affect the flush?\n\nMineral deposits can restrict bowl wash passages and interfere with moving or sealing parts. Cleaning must suit the porcelain and mechanism; badly worn parts may still need replacement.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/#answer-can-hard-water-affect-the-flush>)\n\nMountain Man Plumbing\n\n## Let’s get your toilet working right.\n\nTell us what happens when you flush—and whether it runs, leaks or moves.\n\n- [Toilet & fixture shutoff valves →](<https://mtnmanplumbing.com/services/shutoff-valves/?agentnet=md>)\n\n- [Moving a toilet in a remodel →](<https://mtnmanplumbing.com/services/plumbing-remodel/?agentnet=md>)\n\n- [Sewer & underground drains →](<https://mtnmanplumbing.com/services/sewer-underground/?agentnet=md>)\n\n### Sources & guide record\n\nThis guide uses toilet and bidet manufacturer instructions, flange installation references and public water-efficiency guidance. The interactive model identifies the products it uses.\n\n[Read the public guide data (JSON)](<https://mtnmanplumbing.com/pb/facts/toilet-guide/guide.json>) · [Read this page as plain text](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/?agentnet=md&agentnet_display=html>)\n\n- [Kohler Cimarron K-31648 dimensions ↗](<https://techcomm.kohler.com/techcomm/pdf/K-31648_spec_US-CA_Kohler_en.pdf>)\n- [Kohler toilet installation instructions ↗](<https://techcomm.kohler.com/techcomm/pdf/1476134-2.pdf>)\n- [Kohler toilet service-parts guide ↗](<https://resources.kohler.com/webassets/kpna/brochures/Toilet_ServiceParts_Brochure_FINAL.pdf>)\n- [Fluidmaster refill-tube installation ↗](<https://www.fluidmaster.com/wp-content/uploads/2016/12/400AH-PerforMAX-Fill-valve-English.pdf>)\n- [Oatey: installing a toilet flange ↗](<https://www.oatey.com/resources/project-guides/install-toilet-flange>)\n- [Oatey: repairing a toilet flange ↗](<https://www.oatey.com/resources/project-guides/how-repair-toilet-flange>)\n- [Oatey: setting a new wax seal ↗](<https://www.oatey.com/sites/default/files/2022-11/How%20to%20Install%20a%20Wax%20Ring.pdf>)\n- [Kohler PureWash E590 specifications ↗](<https://techcomm.kohler.com/techcomm/pdf/K-8298_spec_US-CA_Kohler_en.pdf>)\n- [Kohler bidet-seat compatibility chart ↗](<https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDP-PDF/bidet-toilet-seat-f-and-b-compatibility-guide-24-3301-0924.pdf>)\n- [Kohler bidet-seat installation ↗](<https://techcomm.kohler.com/techcomm/pdf/1233549-2.pdf>)\n- [Kohler bidet-seat operation and cleaning ↗](<https://techcomm.kohler.com/techcomm/pdf/1441872-5.pdf>)\n- [EPA WaterSense: residential toilets ↗](<https://www.epa.gov/watersense/residential-toilets>)\n- [EPA WaterSense: checking toilet leaks ↗](<https://www.epa.gov/watersense/fix-leak-week>)\n- [Salt Lake City: what not to flush ↗](<https://www.slc.gov/utilities/wastewaterpretreatment/what-not-to-flush/>)\n\nConnected in your home\n\n## Keep following the plumbing.\n\n- [01 **Toilet repair & replacement →** See the fill and flush parts working inside the tank.](<https://mtnmanplumbing.com/services/toilet-repair/?agentnet=md>)\n- [02 **Automatic water shutoffs →** Understand why a repeating refill can appear in a leak-monitor alert.](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/?agentnet=md>)\n- [03 **Fixture shutoff valves →** Use the toilet’s supply valve to isolate it while arranging a repair.](<https://mtnmanplumbing.com/services/shutoff-valves/fixture-shutoff-valves/?agentnet=md>)",
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