The three hose connections of the fuel pump are:
1.  Pressurized fuel to the fuel rail and injectors.
2.  Return to tank excess fuel via rail fuel regulator.
3.  Excess vapor in tank to carbon canister for emissions control.

One of the functions of the return line is to eliminate vapor locks.
Some newer systems have eliminated the return line by placing the
pressure regulator in the tank.  Warmed fuel is not returned to the tank
which would increase vapors.  Also, probably saves $$$.

I have a good source of fuel Injection info.  One of the instructors at
the Mesa Comm. College Automotive Tech. Dept. (where I take classes to
keep my brain functional) was a tech the at Phoenix GM Proving Grounds
for 15 years where he worked exclusively on fuel injection.

Joel

Joel,
What does your mentor suggest is the best application for Aircraft use. I
would be concerned about accumulated heat with fuel sitting in the fuel
rail/lines, waiting to be used.
A question, how does the fuel regulator (in the tank) calibrate pressure
(fuel) at different power levels.
I assume the Pressure Regulator at the end of the fuel rail merely maintains
max pressure for a full range of fuel demands and bleeds off the excess to
the tank, to be cooled. This wouldn't seem to me to be the best method in a
non return system.
George ( down under)


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