Fuel Pressure Regulator

Hi,

I finally got my SI intake manifold on and was about ready to start it.
I turn the ignition to on (not to start the car) and my bro says shut if off.
I shut if off and gas is shooting out of the fuel pressure regulator.
I thought maybe the bolts wernt tight enough but that wasnt it.
I took the pressure regulator off and found that there was no O Ring to seal the fuel. I hate it when you buy shit off Ebay and parts are missing.
Anyways, heres a pic http://www.binghamtonlife.com/manual/2gsm/images/91-11-107.jpg

Im gonna take the regulator to Autozone and get a replacement one.
It should stop the leak right?
Thanks

Yea, the o-ring is a seal. What would happen if you put the oil filter on without the gasket or with it? same concept. You should have noticed it missing before installing because its garbage after 1 use.