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


In that same vane, I have heard that the reason I have to drop the whole
#@%$##%%#@!!$## fuel tank off the car to change a fuel pump is because of
vapor lock prevention.  So, instead of just changing an inline pump, I've
had to drop tanks to make the changed. What a pain on a Suburban with
a big
shield and 40 gal tank.  Anyway, the comments on the fuel system in the
other chain of emails mentioned putting the fuel pumps on the outside
of the
tanks for ease of replacement.  Great idea but what about the vapor lock
issue.  Is it not a problem in rotaries?  Is the whole "intank pump to
prevent vapor lock" just a myth?

Van Vannoy

Saves money as there is no reason to build a self priming pump.
Any old centrifugal pump will work.
It also cools a cheaper electric motor. Cars are all about pennies saved.

Paul Lamar


I am sure that all early cars just had a external inline pump, later
cars that had external inline pumps had a prime pump in the tank, later
models went straight to the in tank pumps, pennies saved.
    John Burey


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