Welcome back:
As far as pressure testing, do this first. Check for diagnostic trouble codes. There are different sensors in the fuel system that can be causing an issue.
Next, if I recall, you have to place a T in the fuel line where it joins to the rail to get a pressure reading.
Next is the fuel pressure sensor. Here is the manual's description of the component:
The FRP sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to pressure.
Strain gauge type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each engine combustion cylinder.
I attached a picture of this sensor. Make sure it is connected and nothing is damaged or corroded.
Let me know.
Joe
Image (Click to make bigger)
Sunday, May 19th, 2019 AT 8:35 PM