Intermittent CM2250 stalling only at idle

[Rawze]

(05-30-2018 )zyNoT Wrote:  

(05-30-2018 )Unilevers Wrote:  your probably not maintaining rail pressure. I would run a low side sight glass and check for bubbles, the fuel water separators leak alot. if not could be a pump actuator getting lazy or a lift pump cutting out/getting old aswell.

I can now confirm it’s when the truck is going up a hill. It will stall out, lose power etc. however for the most part while driving it maintains rail presssure. Even when going up a hill the pump maintains pressure unless you come to a stop then it stalls. It’s a Paccar water separator btw. Rail pressure seems to hold when truck is off. I wanted to test lift pump by turning key but when I checked actual rail pressure was at 10.2K psi hours after engine was shut off.

Just letting you know that air in a high pressure fuel system is like razor-blades. it iwll eventually cause some serious damage.