I've run veggie on all my trucks for the last 6 years without issues and will be converting my 7.3 as well! There are better ways to do it, better systems so owe horror stories are often from inadequate systems.
At that price I'd be happy to take that van away if I didn't already have mine! Hey, I'll pay shipping to my door on the veggie kit to whomever buys that van and is afraid to use it!
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