Re: Service Bulletin concerning Crown Vic rough idle
Unfortunately as I found out, Ford elected to "decontent" the manual shut-off valve on the 2003 model. The only way to safely cut-off the high-pressure tanks is to manually turn off the tank valves ON EACH TANK. This makes changing the fuel filter a royal pain. Mine came out sparkly clean after 30K miles, so I don't plan on doing this service again anytime soon, and yes, I did the injector cleaning service as well.
I DO NOT RECOMMEND unplugging fuse #5 in the engine bay to disable the solenoid tank valves and regulator, and crack the bleed screw (as you did). If you have a leaky tank valve, or a valve stuck in the open position, cracking that bleed screw can put you in a VERY, VERY precarious situation.
FYI to anyone doing this service, treat those O-rings with tender loving care. They fracture really easy.
2003 Ford Crown Victoria CNG