Any way to know??

[Hammerhead]

(10-22-2017 )JMBT Wrote:  Thanks for the warnings guys! I had the whole system apart when I did the new fuel pump, lines, and mounts. I bled the pressure off like Quick serve instructed before I started disassembly. Same procedure for venting the pressure this time, right? Once the pressure is gone I am good to go?

I don't know for sure.
I would print and read the entire injector R&R procedure, twice, before I even put my work clothes on, nevermind picked up a wrench. They put very clear warnings where fuel pressure may be present, the liability of not doing so would bankrupt them.
The fuel system achieves enough pressure to inject fuel DURING the power stroke! Unless someone is confident they can stop a piston with only body parts, I would not only verify, I'd double and triple check!