CM871 fuel pressure delivery

[Rawze]

if it is losing its prime or getting air in the fuel system, the sound of the electric pump will change ad the air goes thru it.

You should listen for the electric pump changing pitch or sound... getting louder.softer, etc. as it runs for its 2 minutes with the key on and engine not running.

your issue could be air in the fuel, the gear pump starting to go bad, or possibly even the shut-off solenoid not operating correctly.

Could even be just the fuel pressure sensor.

you did not mention the exact fault codes that come up in insite when its acting up. Without this, its also anyone's guess too. You need to find out what codes it is throwing exactly.

all things to think about.

Like others have said.,. you need to also do an injector leak test on it. This ensures that the fuel system components are not getting hammered by combustion gasses, due to a leaky injector.