Intermittent code 559

[Heavyhaulmark]

(03-07-2022 )Rawze Wrote:  

(03-07-2022 )Heavyhaulmark Wrote:  When we did the pressure test, it stayed steady @ 28900-29300 psi. The mechanic didn't officially time it but we watched the pressure drop to -1200psi after a few minutes. On another note, Today it has developed a loud squeal on starting but it is now choking down, starving for fuel and dying much more quickly than before. We haven't been able to pinpoint the squeal as of yet....

loud squeal?

maybe to the obvious and remove all the belts... check to see it if it a pulley or, alternator, or AC compressor seizing up?

The sound is coming from around the fuel filer area, maybe the fuel pump area, I'm going off what my driver is telling me. We have it at a cummins dealer now. I'll update with the prognosis. I'm fearing it's the fuel pump again.....