CM2250 low power poor mileage

[snailexpress]

(10-24-2022 )Rockinbexpress Wrote:  Snailexpress I did do it correctly I watched it drop live for 60 second. I'm curious about the transfer pump. Does it continue to run when the engine is started or does the gear pump take over when the truck is running. I was going to go out and clean the screen in the gear pump inlet and pressure test the low side for leaks but it's raining its ass off today.

When you turn ignition on transfer pump should run to prime gear pump and purge air. Pump will run for few minutes even engine is started. Gear pump will create 300 psi fuel pressure to fuel actuator. Anything over desired fuel will go back to fuel tank.
Actuator will open for the time determined by ECM to supply desired amount of fuel in to high pressure pump barrel, then plunger pushes fuel into fuel rail.