HOW DO YOU ADJUST THE FLUIDMASTER 540 EVERY TIME THE HANDLE IS RELEASED THE FLAPPER CLOSES IMEDIATELY ONLY ALLOWING A SMALL AMOUNT OF WATER TO THE BOWL

The problem may be the flapper that seals between the tank and bowl is leaking or the overflow pipe may have a crack in it. I wouled replace the flapper first and check the overflow pipe for cracks.
Hope this helps.
Bob

I just bought the 540 flapper and had the same issue. It came set on number 1, and it didn't stay up for long at all -- completely inadequate. I adjusted it to number 10, and it is excellent. It took a while to figure out how to adjust it. The way you do it is to press in the two tiny tabs on the white plastic part that keep the white plastic from pulling out. Press them in one at a time with a small screw driver, and you can then pull the white plastic part out easily. Just rotate it to a higher number and press it back in. That's all there is to it. I don't know why they shipped it set to the smallest number.
Andy

Hi turtlerose07...

Sounds like you have one or two problems with the fluidmaster 400.
1...The float is set too high allowing the water to overflow into the overflow pipe and allowing your pump to run too much.
2...Flapper valve inside at the bottom of the tank is not sealing properly, thus allowing water to leak and causing the fluidmaster to keep trying to fill the tank with water and causing the pump to run too much.
Please take time to rate me

Hello- If you replaced old ball and rod set with new fluidmasters they will most likely need to be adjusted, not all toilet tanks are of equal height. You will have to adjust water height,meaning you must keep water level below fill tube located in center of the toilet tank. Adjustment is done from bottom of the fluidmaster, they screw in and out to adjust height. You will notice threads along the bottom part of the fluid master, on the inside of the tank,they adjust up & down! Goodluck!

Hi, American Standard uses a special large type of flapper that is designed for it. If I recall correctly,
It is black plastic with a device designed to delay the closing of the flap. It also has a special chain that is not like other flappers. Home Depot should stock these flappers. Fluidmaster makes a version of it that they sell.
Hope this helps,
Best Regards,
Mark

it is time to replace the flapper. turn water off, remove old flapper, wipe port off with rag where flapper seals, adjust chain to same length as old flapper, install new flapper. fluidmaster is the best brand.

The chain needs to be attached to the tank lever arm. The idea is that when you depress the handle pulling up on the tank lever it will open the flapper and release the float at the same time.

Attaching the chain to the tank lever should be the solution.

this is still the flapper.each toilet has a flapper designed to fit each toilet.your may not have the right flapper for the toilet you have.not all flappers weights are the same.youmay need to add some weight to the flapper or replace it with one that is designed for that model toilet.good luck with your project

See this PDF document link below for a product from Fluidmaster which allows adjustment for the time for the flapper valve to remain open after flushing:

http://www.fluidmaster.com/pdfs/555c_instructions.pdf