I installed all Viton hoses last summer and go back and forth between Biodiesel and straight diesel. No leaks at all.However when I first installed my rerun lines
I had 2 that seeped so I cut 2 new ones a little longer and have not had a problem. I believe that the Viton hoses are stiffer or whatever but they can not be bent as much as the originals. Redo them longer and I bet you will be okay.

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