Hi
I needed a new toilet tank and I've put it on the bowl. My problem is now when it is flushed, the flapper will not stay open long enough to drain water from bowl. When the lever is pulled, the flapper opens water starts to leave the tank, but then the flapper closes and the tank fills back up with water. The only time the bowl will drain is if you hold the lever down until water is out of tank. The flapper has a plastic line on it attached to the lever, don't know what the problem is but gets to be a pain holding lever for long time.
Sorry this post has been discussed before but flapper is new and wondering if the plastic line would cause this. I don't know much... thanks

Sounds like your flapper linkage needs adjusting and, yes, it's the plastic line,(linkage).
With the flapper seated the linkage wants to have 1/4" of play. Too much play and the flapper doesn't get pulled back enough giving you a short flush. Too tight and it lets water seep past the flapper. I adjust the chain by the link and if it needs fine tuning, I bend the flush lever rod a bit untill I have the desired play in the linkage. One more thing about a flapper. you will see where the old flapper hooks onto the base of the white overflow tube. On a older type with no hooks the flapper has a ring that slips down over the overflow tube to the seat. If your tank has hooks, take a sharp knife or scissors and cut the neoprene ring off on the marks provided and hook the flapper on the hooks. Leaving the ring on will interfere with the flush. The water level in your tank should be 3/8 to 1/2" below the top of the overflow tube when the tank's filled. Good luck, Tom

Thanks speedball one more question... can you have two different types of pieces? The tank and bowl? I mean my bowl says 13.25lpf the tank says nothing but on the instructions it says that recommended pressure is 20psi. The tank is smaller than the original and I was on a site that says you can't mix and match some models due to gravity flow of water and pressure.
Thanks for the help from someone who's still learning lol

If the tank bolt holes match up the tanks are interchangeable. The smaller tank that you describe sounds like a 1.6 gal water saver tank. Since they've come out there have been many complaints that you have to flush twice to remove solids, (some water saver!). It's nor so much the lack of pressure that impedes the flush as the lack of volume. Since you've inmstalled the tank do the adjustments and let me know how it flushes. I have a new smaller tank installed on a old regular bowl and it's flushing just fine. Good luck. Tom