When doing a mpfi conversion in a 91 civic hatch would I have to get a fuel pressure regulator because the SI ecu is programmed for a 1.6 engine and mine would still be a 1.5 so then the extra fuel the computer is making the injectors put out has to go somewhere so would I need one to run the extra fuel back to the tank???

 

whatever FPR came on the fuel rail will work fine dude.

 

just make sure theres a vaccum line running to it

 

K thanks