uneven fuel return, 2010 kenworth t660, 450 ISX cummins
It started about a year ago. It holds a lot more fuel in the driver side tank, sometimes the difference is more than 40 gallons, but mostly 25 to 30. I have checked the vent tubes, and tried leaving the fuel caps just barely snug, to really tight, nothing seems to make a difference. Also if I stop for the night, it will cross over, and even out, once I start driving again, it moves back over to the driver side. Of course our shop manager thinks I am crazy, and says there is no way the fuel can do that when the truck is off, but it does! It leads me to have to fuel more frequently than I should have to. Any help would be appreciated.
Is this a worthwhile discussion?