From what other people are saying it sounds like the o-rings are the culprits. Since my fuel lines seems to be kind of hard (all originals) plus they don't cost that much so they're getting done on my car.

Also, found this post. Scroll halfway down the first page and Rick Miley posted just about everything you'll need w/ MB parts #'s. It's for a 99 E300 and has gaskets as well.
http://www.peachparts.com/shopforum/showthread.php?t=105291

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Andy, North Jersey
1999 E300 TurboDiesel 116k miles

Not directly related, but if you are doing the fuel lines and/or the viton O-rings. Might be just as good a time to do the fuel filter and pre-filters. But with your WVO conversion you may already have other plans.

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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg