Chilton's says you have to release the pressure by loosening/removing any part of the system, e.g. injector. When you go to that part, it says you must relieve the line pressure first!?!?!?
I think bedlamite has it right!
Mines still stuck after Aerokroil, "da tool", much foul language, pounding, twisting, etc. Hard to get the BFH in there. 103,000 miles on the same filter, and LOTS of road salt!!
Stay safe, get the torch!
Bob