Excess foam

[ECbeerman]

I recently brewed a Bohemian Pilsner. I naturally carbonated it with priming sugar then put it in the keggerator. I currently have it set at about 11 psi, but every time I try to serve it I get mostly foam. I tried to turn the pressure down to five PSI and had the same results. Any ideas?

 

[Yooper]

It sounds overcarbed. How much priming sugar did you use?