If your faucet still leaks the stem may be leaking and you should replace the faucet.
Frost free outdoor faucet repair.
Another place a frost proof faucet can leak is from the anti siphon portion of the valve if the faucet has one.
Remove the faucet packing nut by turning it counterclockwise with an adjustable wrench.
Buy a repair kit that matches your faucet brand and use the packing from the kit.
Simmons 850sb repair kit 8 pieces for use with 4800 model and 800sb series yard hydrant.
Use lockjaw pliers to support the frost proof faucet body while removing the packing nut.
Remove the nut then reattach the handle and use it to pull the valve stem straight out.
If your faucet leaks out of the spout when it s turned off the washer is bad.
On frost proof faucets the washer is located on the end of the long faucet stem.