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Posted for "Tracy Crook" <lors01@msn.com>:
I assume my pressurized fuel line will enter on one side of the fuel
rail, and the opposite end will have the fuel pressure regulator, with a
return to my sump tank. It would seem that a setup like that would only
have
the fuel pressure regulator regulate the fuel pressure returning to the
tank,
whereas if I brought the pressureized line to the regulator first, it
would
regulate the pressure to the injectors. Do I understand you correctly that
the
fuel returning to the tank is what gets regulated by the fuel pressure
regulator?
Not quite right yet. The regulator controls the pressure in the entire fuel
rail system, not just the point it is hooked to. It regulates by bleeding
off enough fuel to reduce system pressure to the desired point. Think of
the pressure regulator like your thumb held over the very end of a hose. By
varying the pressure of your thumb on the end of the hose you can control
the pressure in the entire length of hose. That is exactly how the
regulator works but instead of spraying the fuel past its "thumb", it
collects the leaked fuel and returns it to the tank.
Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com
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