fuel regulator

[86Nick]

What is the main purpose of the fuel regulator? does it regulate fuel to the rail or back to the tank?

[JHensberry]

Per service manual, the regulator maintains the pressure to the injectors under all driving conditions and controlls the amount of fuel that is recirculated back to the tank.

[kenmosher]

To add to that ...

It maintains pressure to the fuel rail using vacuum/boost as a reference and controlling how much drains back in the return line.

The objective is to keep a constant differential pressure across the injectors ... i.e. if the pressure in the manifold rises, the fuel pressure rises to maintain the injector differential pressure.