I just bought an o9 6.7 2500. Had it checked out and fixed several maintenance issues. However, we just filled the tank and noticed after driving a fuel leak from on top of the tank at a steady drop per second rate. The leak comes from the top of the tank. After a few minutes the leak quits. I suspect the return line to the tank because that is under pressure but I guess it could be a leak in the tank itself. I am getting ready to put the twin filter (2u Donaldson, and water separator) under the driver's seat and above the cross member and would like to know if anyone else has had this problem. I have crud catching filters on my other Cummins trucks and I know they have saved me injector woes. Do I need to pull the tank to find this leak, and at the same time maybe install a Fass pump? Thank you in advance