Fuel Pressure Regulator

Depressurize fuel system. Loosen pipe clamp securing left-hand cold start injector to fuel rail and pull pipe from rail. Connect pressure gauge to fuel rail and tighten pipe clamp.
Pull negative "VE" lead from ignition coil and switch on ignition. Connect pump relay terminal 85 to ground. Check pressure gauge reading, it should be 28.5-30 psi. Remove ground connection to terminal No. 85 of fuel pump relay.
If satisfactory pressure readings are not obtained, it will be necessary to either adjust the pressure regulator or repair the leak-down condition, before proceeding with test procedure.
If satisfactory results were obtained, loosen pipe clamp and remove pressure gauge from fuel rail. Reconnect cold start injector supply pipe and tighten pipe clamp. Switch off ignition.
NOTE: Pressure reading may drop slowly though either regulator valve or pump non-return valve. A slow steady drop is permissible, but a fast drop should be investigated.