You might want to clarify what type of fuel we are running. I am running no less than 25% biodiesel. Sometimes I run as much as 50% biodiesel, 25% filtered used cooking oil, with 25% ULSD.
My fuel lines in the engine compartment were replaced by the PO with standard new fuel lines. I replaced the injector return lines with viton. The o-rings on my spin on filter are viton. I have a new viton o-ring for my tank screen, but have not installed it yet. (I sell these on my website,
www.fryerpower.com)
The lines back at the tank have not been touched. The injector pump has not been touched.
No leaks so far.
-Jim