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The fuel pressure regulator on a 1990 Geo Prizm is located in the fuel line that runs along the valve cover of the engine. It is an inline device that is no bigger than the fuel line itself.
The service manual states there is a "fuel cut-off" valve which sends evaporated gas in the fuel tank to the EVAP canister in the engine compartment. The valve is located in the fuel tank. I am not sure if this is what you are referring to.
The fuel pressure relief valve is located Under the Plastic cover on the fuel rail.
If it has one, it will be located on the fuel rail.
where is located the fuel pump relay on 1996 geo prizm
Connect a fuel pressure gauge to the schrader valve located on the fuel rail that feeds the fuel injectors.
The 1994 S10 has a fuel pressure regulator located in the throttle body.
were is the Schrader vale located
Remove the gas cap. If you do not hear the pressure release, then press the shrader valve located on the fuel rail.
Its located on the bottom of the throttle body right next to the fuel pressure valve.
A vacuum operated daiphram valve located on top of the fuel rail
Part of the pump module in the tank.