Leaking outside faucets are easy to ignore because no one hears the dripping. However, leaking faucets waste a lot of water. If a drip occurs every second, a total of 31,536,000 drops of water are lost in a year. This is approximately 513 gallons of water. In areas where water must be paid for, this can cost a homeowner a lot of money and is a waste of a valuable resource. Repairing these wall-mounted faucets is a task that most homeowners can accomplish in a few minutes with only a screwdriver and an adjustable wrench.
Shut off the water supply to the faucet.
Remove the screw that holds the handle to the faucet stem.
Pull the handle from the stem and set it aside.
Turn the packing nut counterclockwise with an adjustable wrench to remove it. Set this aside also.
Turn the faucet stem (you can use the faucet handle for this) to open the faucet. Keep turning until the stem comes out of the faucet.
Remove the center screw from the bottom of the faucet stem. This screw holds the faucet washer to the stem. Remove the washer. This will usually be black and is a soft plastic flat--or slightly cone shaped--washer.
Inspect the faucet stem for corroded areas where the washer sits. Major corrosion here will require replacement of the stem.
Look inside the area of the faucet body where the washer makes contact when the faucet is closed. Again, check for corroded areas of the faucet seat and replace the faucet with a new one if the seat is corroded.
Install a new washer on the faucet stem, making sure that the washer is the same diameter and type as the original washer. Replace the screw also if it was damaged by corrosion or during disassembly.
Screw the stem back into the faucet body.
Replace the stem packing with new packing.
Screw the packing nut back over the faucet stem. Use care to tighten this nut only enough to compress the packing, but not so tight that the packing is damaged. Don't worry, it can be adjusted later if you don't get it tight enough initially.
Install the handle and retaining screw.
Turn the water supply back on and check for leaks. Look at the area where the stem comes through the packing nut. If a leak is seen here, tighten the nut just enough more to stop the leak.