Single lever kitchen faucet with pull out sprayer is leaking.

You need to turn the water off under the sink. Disconnect the sprayer hose from the threaded shank under the center of the faucet body. Pull the spray head out of the faucet. Contact Blanco to receive your faucet parts free.

Moen has a diverter built in that will need to be replaced.

use the same steps as when you replaced the cartridge, but this time you will need to remove the spout, there is a small diverter, you will see it when spout is removed.

take this part with you to the hardware store, along with the O Rings from the spout, as they will need to be replaced also

use a non silicone faucet lubricant when putting back together

No the length doesn't matter. When you turn the faucet on, you also fill the hose to the sprayer, and it may expand slightly, causing the sprayer to move a little. Is the drip from the end of the spout at the aearator? or is it around the faucet lever. If it is the lever, you should be able to tighten it slightly. If it's the end, make sure your aearator is clean.

The spray head will need replacing, it unscrews and the new one will fit right on

you may need to get the moen cartridge puller,either moen brand, or brass craft, they can be tough to pull some time's

What often happens with this type of faucet is the shaft becomes corroded inside the lever. If you place a cloth around the base of the lever and pry upward with two equal size large screwdrivers the lever "should" pop off. I've had to replace several of these type unit for this very reason. Thanks, Dana

By "leak in the stem" I assume you mean you're getting water in the cabinet below the faucet. High likelihood is it's the hose - either loose where it connects to the faucet or the sprayer. You can pull it out and check to be sure it's tight at the sprayer. To check the faucet end, you'll need to be under the cabinet with a light. If you don't find one of those connections loose, it's likely one or the other is leaking, due to a hose defect or washer (or missing washer).
The only way to see that is to turn the faucet on full (cold) with the sprayer pulled out and look for a leak in the hose behind the sprayer. If not there, leave the water running (may need another person to hold the sprayer) and inspect under the cabinet with your light for a leak either in the hose or at the connection to the faucet. If the problem is the hose or one of the nuts, it's an easy deal to buy a replacement hose - Home Depot stocks Moen.

you have to locate the water shut off valves before you attempt removing the water lines, hopefully they will be located on the lines under your sink, if not you will have to shut the water main off coming into the house. After you have shut the water off and disconnected the lines, look under your sink at the back were your faucet comes through the sink and you will find the fasteners, unscrew these counter clockwise and the faucet will lift out .

you can call or e-mail the company, if the faucet is the one in the picture it is a single cartdridge, turn of bith hot and cold water, take an allen wrench into the little plastic cover to remove the handle , unscrew the top cover or it might pop off, that there is either a large lock not or 3 screws holding down the cartdridge, take it out replace it put some faucet frease around all rubber gaskets then install it in the smae way it came out

no its somthing in water filter rust or dirt in line.take apart and drain line. thank you for useing fixya please rate me