The toilet continuously runs. - Toto Plumbing

The most common reason for a toilet to continue to run is a problem with either the flapper or the entire flush valve itself. The water is slowly draining so the fill valve keeps running.
The flapper is the least expensive and easiest solution, so start their. It's usually around $5. If that doesn't solve the problem, I would purchase a flush valve kit, around $20, and replace your flush valve.
*Note: If you have to replace the flush valve, you have to take your toilet apart. Start with the flapper.

With lid removed, look down into it and remove and replace the black rubber thing in the center. This is the flush valve and is worn to the point where is no longer provides a tight seal allowing water to pass and run into bowl. Also, could be something underneath it not allowing it to seat properly.

After flush the system must close the hole which lets water into the toilet. If it does not close after flush, it is continuously letting the water thru. Check if it closes after flush and allows tank to fill.

It could be the type of flap you are using. I would suggest you try a different shaped flapper (a cone would work best) and if that doesn't do it, put a new kit into the unit, because it could be that the float system is sticking causing it to continue running.

Toilet runs continuously or doesn't flush adequately

Jiggling the handle might work for a while, but if your toilet is always running or doesn't flush adequately, you need to perform these simple fixes that usually can tame a noisy, inefficient toilet.

Check the Chain

The chain attached to the rubber flapper often becomes loose, causing incomplete flushing and/or continuous running. To fix it, remove links from the chain using needle-nosed pliers until it's tight.

Check Water Level

Improper water levels can also cause problems with your toilet. This can be fixed by adjusting the ball ****, which is located next to the overflow pipe, the open tube to the right of the handle. Adjust the ball **** so the water comes to ½ " below the overflow pipe.

Clean the Surface of the Flush Valve

A continuously running toilet can also be the result of a faulty flush valve. Because the valve is made of rubber, it can decompose or warp allowing water to escape from the tank into the bowl. Clean the sealing surface to see if this will improve the seal. If too decomposed or warped the valve may need to be replaced.

Replace the Flapper

Remove old flapper and replace with a suitable replacement. Attach the flapper to the overflow pipe inside the bowl. Then attach the lever chain from the flapper to the handle lever making sure the chain is taut.

This video will help familairaize you with the flushing mechanism and the repair:

I don't know what you mean by "pumping" the tank. If the toilet runs, then either the fill valve is defective or the seal on the flush valve is defective. First, check to see that when you move the float, the toilet stops running. If it does not, then replace the fill valve. If it does, then inspect/replace the seal on the flush mechanism at the bottom of the tank. If this seal is bad, you can usually see water continuously flowing (slowly) into the bowl. You will see ripples on the surface of the water in the bowl.

Check level in tank to make sure water is not running down over flow pipe. The float in tank should be cutting water level off about 5/8 inch before top of pipe. If this is it adjust the float or valve for proper level it shoul dhave amark on stand pipe also..

Also check flapper and make sure it is sealing off after you flush it can get caught on chain or what ever is connected to it from handle. If it is too long you can adjust it also.

The fill valve is stuck on and needs replacement, checking this part every year is a good idea.

Check the flapper in the bottom of the tank to see that it is sealing good. Sometimes they need replaced.

The adjustment is inside. It just needs to be adjusted.