Originally Posted by rjolly87
That'* one way. You can also use the Schroeder valve on the fuel rail.
This is what I do, but while you're here, I bet you have a fuel pressure gauge. Fuel pressure gauges almost always have a drain valve and tube to relieve pressure. Run the drain tube somewhere safe, hook the gauge to the test port, use the pressure release valve to let the pressure out.
Bonus, now you have the gauge hooked up to see what changes after you swap pressure regulators.