Electronic Returnless Fuel

Fuel is supplied at high pressure to the fuel injectors through a fuel injection supply manifold, also referred to as a fuel rail.

Fuel System - Electronic Returnless:

5. The fuel rail pressure (FRP) sensor provides the PCM with the current fuel rail pressure. The PCM uses this information to vary the duty cycle output to the FPDM to compensate for varying loads.
6. The engine fuel temperature (EFT) sensor measures current fuel temperatures in the fuel rail. This information is used to vary the fuel pressure and avoid fuel system vaporization.