Hello and Welcome to Justanswer, My name is XXXXX XXXXX I am here to try and assist your with your question.Fuel pressure is tested with installing a fuel pressure guage to the fuel rail service port.
how do u take off the scharders service valve
You do not take the valve off, the guage screws on to it.
The fuel guage screws onto the valve.
i cant find the fuel rail service port
do i have to take any thing off to get to it
The port is on the fuel rail on the opposite side as the pressure sensor. Just like in the diagram. A scan tool that can read the data stream will also give you a pressure reading.
is there a sliver cap on it
that is hard to get off
In nost cases it a black plastic cap just like a valve stem.
what should the press be
You need to see 35 to 70 PSI.