Good morning! I purchased a 2003 Fleetwood Expedition 34W and it did not have a diesel fuel cap. It has a 6 cyl Cummins 5.9L ISB Turbodiesel and is on a Freightliner chassis. I have used the Fleetwood, Cummins, and Freightliner owner sites to search VIN and part #s and attempt to replace it and...