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Follow the rail line that runs to the injectors. You will find the pressure regulator.
It is in the fuel tank.
A bad fuel pressure regulator will cause the car to stall or not run .
that pump is in the fuel tank
Most GM fuel filters are under or slightly behind the driver.
It is in the fuel tank so the tank has to be dropped, tank cover unscrewed, and fuel pump extracted and replaced.
check your fuel pressure regulator, it could be leaking http://flickr.com/photos/thatguyfromcchs08/2233062257/
The voltage regulator is internal to the alternator. TechJK ------------------
Did you change the fuel filter? Have you checked the fuel pressure regulator?
A leaking fuel pressure regulator is the most common cause for a rich condition on the Olds Aurora 4.0L V8. -------------------------
Try checking the fuel pressure regulator that's what gives the engine gas and how much its hooked to a vacuum line.
It is part of the fuel pump module inside the fuel tank. I think the only answer is to replace the entire unit.