Flushing and floatball adjustment problems

after flushing observe flapper if it flops back and water is still getting by when tank is full than replace the flapper /if water is running down tube [high level]in tank than adjust level or if not responding to adjustment than flush unit is bad

The small black tube that goes into the overflow is used to fill the bowl after flushing. Would check to make sure that water is coming out of that tube at full force or if its coming out at all.

lift off cover and shorten flapper to handle chain/rubber connection flapper not opening all the way

Not being a plumber by trade I don't want to bad mouth what your plumber had to say but there may be other things to consider.
If the toilet does not flush directly into the main drain there is the possibilty that the coupling between the main drain and the toilet drain is under-sized which could cause reduced water flow and your toilet not flushing completely.

Which style of flush valve do you have? If it is the dual-flush option (solids/liquids) I do not know how to adjust those. If you have a traditional style, then the flapper or ball is closing too soon. You need to adjust the guide arm (flush ball) higher or shorten the chain between the flapper and the handle. Adjust this carefully or you will have it fail to seat and the toilet will constantly run.

I hope this helps.

Cindy Wells
(who needed to replace the fill valve and the flapper at her home earlier this week)

It's either plugged or the tank isn't filling properly.
If it's the tank then the fill valve in the tank needs to be adjusted. There should be a screw to adjust the float ball. Back the screw out until the fill valve starts to run;let the water run until the tank fills to the fill line then turn the screw back in.Try flushing the toilet. If that doesn't work then the toilet is probably plugged.
If it's plugged you may need to rent/borrow a snake to clear the line.

lift the lid,and look, flush, the rubber valve that opens when lever is is pulled should float, so either its very loose or broken and needs to be replaced.plz rate-bozcro

I've never had a problem with Eljer toilets. Try adjusting the fill valve so that it allows more water to enter the tank (if you're over the flush valve, install a coupler made from PVC around the neck of the flush valve- inside diameter of the coupler needs to be the same as the outside diameter of the flush valve filler neck).

The problem is the flapper closing too soon or too late to get the best flush. There are several brands out there that are adjustable. I agree about finding another plumber if he can't fix this, but you should consider buying a new low flow toilet. There are a few brands that have a "Power Flush" tank which uses a pressurized bladder inside the tank to flush the toilet consistently and completely every time. Another upside is the water savings (1.6 gallons versus 4-6 gallons).

Sounds like the flapper is stuck in the open position.
They sometimes get hung on the flush tube or the chain hanging from the handle.

Is the water level overflowing the tube?
If so, try adjusting the level down, you may need a new fill valve if that doesnt work.