Fuel pump

Here is a guide to help you see what you are in fo when testing the fuel pressure. Connect the gauge to the fuel rail at the engine.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Measure fuel pressure - 42 to 48 pounds.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers