Cummins X15 - How to check fuel restriction and test for air in fuel (aeration) Cummins CODE 559

[@billyyoder8171]

Thank you for your videos. Good job. Have a great day.

[@juanavila1611]

where was it sucking air from? great video thanks

[@AcousticHills]

@@juanavila1611 thanks! It was coming from the line between hp pump and fuel module. Had a small split in it.

[@ox-cetane4887]

How do you know how much solubilized oxygen and dissolved air is in the diesel fuel?

[@AcousticHills]

@@ox-cetane4887 you see how much bubbles are coming from the line. There should be none. It should run clear.

[@ox-cetane4887]

@@AcousticHills Indeed, ULSD has significant problems with fuel oxidation and air contamination in the ULSD itself and nobody is talking about it.

[@ryanm6027]

Dealing with this right now, my gauge read -25 HG gonna see whats causing it tomorrow

[@AcousticHills]

What did you end up finding?

[@ryanm6027]

What i found was what appeared to be paper towel jammed up inside the thermo recirculation valve, had me pretty stumped for a bit because everything tested good, i pulled the line off and saw a bunch of brown paper towel jammed up inside. I work at a peterbilt dealer and the truck came back 3 times for the same 559 code.

[@AcousticHills]

@@ryanm6027 Great find!