My car (L28e, turbo-ed up, with megasquirt, see my profile for details) came with the stock fuel pump and fuel pressure regulator (FPR) attached, and with a brand new, uninstalled walbro 255 fuel pump. The previous owner told me the original pump was starting to show fatigue at high boost/high RPM.
I haven't seen any signs of fuel starvation under any circumstances, although I am getting crazy, all over Air/Fuel Ratio (not under high boost/RPM). Now, my megasquirt is currently tuned like crap (litterally, really really really badly) which probably cause a significant part of those fluctuations; I also suspect that some injectors might be bad, or something else, so I'm not changing any AFR settings until i test out the injectors (in a few weeks, once I park the car for winter).
Long story short, I thought it might be cool to install the new fuel pump.. it looks nicer, it'll probably buzz less than the old one (mmmmmwiiiiiiiiiii.......), and it'll eliminate the possibility that the pump is contributing to my AFR woes.
HOWEVER! I've been told by a friend who's a mechanic that the more powerful pump will most likely kill the stock fuel pressure regulator. I'm inclined to try it with the stock FPR, but don't want to drive to work and have the car die on the way there from the new, awesome power of insane fuel pressure (echo, echo, echo....).
I don't have a lot of money to put on the car (read no money at all) so I'm curious to see what other people think of the issue, what are your personal experiences, before I try anything out.
Thanks a million!