Valve Soak - via FPR - where is FPR?

[RobPatt 525ia-M50TU@121K]

Want to suck the Ventil Stabil (sp?) through my FPR on the M50TU, to try to alleviate some pinging. Will also run some Techron in the gas, and an Italian tune up on I-10 to Pensacola.

?: 1. Where is the FPR on the M50TU?

Otherwise, I've read the procedure(s) here before, and think I will do the 10 minute soak, then start the engine again. Any help appreciated. TIA
Rob.

[632 Regal]

i read that you can soak the injectors in cleaner and use a 9 volt battery to move the plunger back and forth...sounds like a spark might not be a good thing so dont do it inside your house.