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Re: 2001 5.7 Fuel pump mod tech question
your posting is quite weird.
a 2001 does not use a 5.7L engine.
your using an airtex pump instead of the delphi pump as all recommend.
you buy the whole pump assy because these have issues with the whole OEM assy after 10 years. electrical connections/sender/suction leaks.
when the pump is replaced the relay and filter should be replaced.
the fuel pump regulator should be checked with the pressure testing proceedure for whatever engine your vehicles has after any repair to ensure this has the correct pressure and no other fuel system failures like injectors or regulator or leaks.
the return line is used so that the injectors get the correct operating pressure. you plug up the return line the pressure will not be correct.
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