hmmm... Sounds like you're picking up air between the fuel pump and the fuel rail. But if it's "compressed", then why is it not escaping through the hole where it's leaking?
Here's a silly question... Do you have fuel in the gas tank? I mean, certain tha you have fuel in there?
If you do, sounds like either you have a leak, or the fuel pump is sucking air from somewhere. But if you've ever seen the fuel pump canister, you'd understand that's damned near impossible to do, unless you're out of fuel.
Even so, I don't think the fuel pump can actually compress air too well, since it's designed to move liquids not gasses.
Start the car, get a rag, and see if you can purge that air through the schraeder valve. Even though, that air should purge by itself when the car is running, through the injectors.
Are you SURE you're working on the correct valve? Take a pic of the valve and fuel rail you're working on. Not calling you an idiot or anything like that, but I'm starting to wonder if you're not purging your AC freon.