I am not an engineer but does anyone know why the fuel pressure regulator
on a car engine is

installed at or close to the fuel rail?


Wouldn't it be easier to pressurize the fuel rail like they pressurize
any hydraulic system, with the pressure regulator
installed right at the pump? That way we would not need a fuel return
line?

I appreciate your comments. Thanks.


Ramon

It has to do with the return line system. Fuel is constantly recirculated
to keep it cool I think. Keeps the air bubbles out which would cause a
miss.

Paul Lamar


Some of the new cars are returnless systems. A fuel pressure sensor
tells the computer what the fuel pressure is and the computer sends the
correct amount of power to the fuel pump to maintain required fuel
pressure.  Do not think there is any return to the tank for cooling and
purging.  Less money.

Murry I Rozansky

The computer may control the pump pressure directly by pulse
width modulating the pump voltage. No real regulator required.
Just a cheap pressure sensor. In theory one could build a cheap fuel
injection system like this. The problem with that is at idle
the injector would dribble and not mix well with air.
The high pressure injector gives a spray regardless of duration.

Might still work for an aircraft as the engine stay's within
70% of max power all the time.

Paul