Low fuel rail pressure

[SquareOne]

(02-13-2023 )amermextrucker Wrote:  If it's a CM2350 on mine I had code 0559 , turned out the issue was the check valves in the fuel pump head went bad, when doing a leak down test pressure couldnt build to commanded pressure, but like I said I had the code of death on mine.

I had this issue on my CM2350 last year, although I didn't have the code or any 'noticeable' changes in how the engine performed. Only indications were a slight fuel leak around the torx plug on top the high press fuel pump head, and a stumble when performing the fuel pressure test with Insite.

The solution was to replace the high pressure fuel pump head assembly (will come with the barrels and plungers pre installed). The head is not a serviceable part once compromised.