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The only thing I have seen total fuel line failure due to bio diesel was on a german made Hatz air cooled diesel engine. The injector return lines suddenly gave out as soon as we put b20 in them.
The 6.2 and 6.5 use the same style and size of push on return line.
I even use german made Hatz line on my 6.5L.
After the lines were replaced they didn't develop any more leaks, as if Hatz had already switched formulation of their rubber.
So there are fuel lines out there that will just fall apart on contact with biodiesel but they are not real common these days.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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