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


It is just like screwing the fuel  pressure regulator into the side of a
carburetor. The regulator provides  accurate pressure where it is needed and
absent any additional inputs like  heat or flow dynamics. Same for the fuel
pressure sender.
Lynn E. Hanover


Hi You Guys
The motor manufactures do now on some vehicles put the regulator in the fuel
tank along with the pump and contents sender, presumable on cost grounds.
(One self-contained unit)  here's a patent.
http://www.freepatentsonline.com/6622707.html

Honda went return less about 2001
http://www.aa1car.com/library/returnless_efi.htm

Not sure if there are any real benefits to go return less for aircraft.

Clive