Depends on the engine, V6/8. In a v6 it is located in the intake manifold attached the the side of the Fuel Injector box. In a v8 it is located outside the manifold.
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In the throttle body.
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Voltage regulator? Inside the alternator. Fuel pressure regulator? Inside the throttle body.
below the radiator cap in the gas tank right behind the exhaust bearings
Inside the alternator
It is inside the upper intake manifold.
On the fuel rail--on the driver's side of the motor...
Fuel Pressure Regulator is located on the fuel rail.
Yes.. But it would be cheaper to just buy the whole regulator and replace it.
No you dont have to change the fuel pressure regulator unless there was something wrong with it to begin with.