It is underneath the engine. Put the car on jack stands, unbolt the fuel fiter / fuel regulator assembly, unclip the fuel line bundle from its retainer (be careful not to damage the retainer), disconnect the lines from the unit as you remove it (the plastic fuel line retainers must be replaced when reassembling, installation is the reverse of the above. Hope this helps.
The fuel regulator is inside the fuel filter in a lot of Saturns.
4.3L fuel pressure regulator is under the upper intake manifold. It is attached to the fuel injector bank.
On a 98-2000 its right after the fuel rail hidden bellow the air intake manifold
That vehicle has a mechanical fuel pump and a carburetor. The fuel pump has a built in regulator and is not serviceable.
The fuel pressure regulator maintains 41 to 47 psi to the fuel injectors.
On the right front frame just behind the upper a-frame and under the a/c evap housing.
The 1985 Chevrolet S 10 blazer fuel pressure regulator can be found on the top of the engine. The fuel pressure regulator will be near the fuel injector pump.
The fuel pressure regulator on a 2002 S 430 Mercedes Benz is located in the fuel pump. This is a very important part of your car as it regulates the amount of fuel that your engine takes in.
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A fuel pressure regulator on a 4.3L can leak undetected but cause the vehicle to fail emissions.
Which regulator? The voltage regulator is INSIDE the alternator. If that regulator has failed you can either rebuild the alternator (don't even try unless you're experienced), or you can simply replace the alternator. The fuel pressure regulator is near the rear of the engine, drivers side. Just get a new one, pop out the old one, clean everything well and put the new one in it's place.
Do a fuel pressure test