The '95 cars were the only ones with vacuum referenced fuel pressure regulators. Like MetalJim mentioned, they are on the end of the fuel rail and have a vacuum line running to them. They change fuel pressure relative to intake manifold pressure. This keeps the fuel capability of the injectors constant. The later cars have fixed fuel pressure regulators back by the gas tank. Fuel pressure stays the same no matter what the intake manifold pressure is. The fuel capability of the injectors will go down as intake manifold pressure rises. The ECU compensates for this automatically.

Corbin

'95 ESI-T
Now with more power and fewer leaks



Gimme fuel...Gimme fire...Gimme that which I desire