My kitchen faucet,American Standard,with pull out sprayer is leaking somewhere in the faucet.I changed the cartridge and it still leaks.The leak fills a huge bowl every night.Please help!

SOURCE: base of faucet leaks- cannot remove set screw at

if you are having trouble removing the set screw make sure you are using the correct size allen wrench and confirm that it is a allen screw and not a trox screw. After doing this try tighten the screw slightly before loosening it. This should break it loose.

SOURCE: I have a single handle

Using the number you gave it is an American Standard faucet here is a link to a parts place.
I would use the factory parts.

http://americanstandard.faucetdirect.com/index.cfm?page=product:partsDisplay&productId=4205.104&manufacturer=American%20Standard

SOURCE: This is American standard clear tap kitchen faucet. How to stop leak? I have already changed cartridge. Still leaking.

That's one heck of a leak! Generally, replacing the cartridge should solve problems like this - but you said you've already done this so it suggests to me that there is an issue with the faucet body that the cartridge sits in - or that the cartridge was not properly installed.

If your water is hard and untreated, deposits can form and may also eat away at the metal. I suggest removing the cartridge and even the faucet (if needed) to carefully inspect and thoroughly clean the area that holds the cartridge. Soak the faucet in white vinegar as long as needed to dissolve minerals / hard water deposits. Scrub with an old tooth brush as needed.

Check the directions for installation of your cartridge once more. If unable to locate - chek online. Sometimes these are larger than those included with the cartridge. Attempt to reinstall. Contact the faucet manufacturer's customer help line if unsure about installation or if the leak persists after reinstallation.