Posted 7/1/2016 19:03 (#5385946 - in reply to #5385853) Subject: RE: fleetgard fuel filter only...
Check valve should be on the line going into the filter coming from the back of the ECM. Or there abouts somewhere. Also try another new filter. I had some trouble with ours and the little gasket that goes on the stem of the filter was too big and wasn't sealing properly.