Bring the TSB mentioned in this thread:
http://www.ft86club.com/forums/showthread.php?t=111525
I have a 2013 FRS with the latest revision of the pump. So far it seems to be working for me. I've had it since November of last year, been driving it in winter (no chirps) and now in semi-spring (80's-90s) no chirps.
I'm using E10 from Costco. It's worth a shot of trying. The only thing is, there seems to be more clattering and clicking noises from the Engine (sounds like a Diesel?)