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



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