where is the fuel pressure regulator on a 1999 camaro v6 how do i test it on 1999 Chevrolet Camaro

replaced pump but it still seems wrong i have 45 pounds of pressure at the fuel rail please explain the regulator and how to test it

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Follow the two fuel lines to the engine, one is the feed line to the fuel rail. The other is the return line. The fuel pressure regulator is mounted were the return line comes off the fuel rail. You should see a small round part, with a vacuum line connected to it, this is the regulator. You unplug the vacuum line and crank engine see if fuel comes out of the connection if it does the diaphram is bad and it needs to be replaced. If that checks out ok, take a fuel pressure reading with a test gauge connected to the test port. Plug in the vacuum line take a reading and then again with it taken off you should see a increase in pressure when it is removed if not it is not closing replace it. the pressure regulator works to keep a pre-determined amount of pressure in the rail if it becomes to high the valve opens and returns fuel to the tank then closes to keep enough pressure to open the injectors. Have you checked the fuel pressure before and after the fuel filter? a plugged fuel filter, can cause low fuel pressure too.
this all started with low pressure and stallimg it took sometimes an hour to restart it and would then go for a while again we replced the pump and filter and now we have anywhere from 40 to 45 lbs during road test it last a few mins and the at exactly the same time the fuel purges to 55 it then stalls and is irratic between 35 and 55 the car restarts promptly and then repeats itself promptly i checked for fuel in the vacum line to the regulater and found none i will perform the test you outlined for the regulator and get back with you THANX