I have a 1990 F150 4.9 that I believe has a low pressure fuel problem. I can't locate the schrader valve so I can test the fuel pressure. I know that it is located on the fuel rail but it is not. Where on the fuel rail on the passenger side? It has two lines on the fuel rail with one going to the pressure regulator. No schrader valve that I can see. Any help please. This truck has dual tanks. Thanks

 

found it, on the fuel rail by the fire wall.