Im swithching my 83 300sd to run on bio. I heard about the gunk in the tank gets dissolved when you switch. I have decided to remove my fuel tank and clean it before I put the biodiesel in it. What is the best product to clean the tank and what is the process? A person suggested that RUG slohed around in the tank would do the trick.

Also I had heard that waste oil that had meat cooked in it wasnt appropriate for a straight WVO conversion. But is that oil OK if you are making bio with it and taking the animal fat out in the bio making process?

Have a look at the excellent DIY from Dave Morrison: "240D fuel tank removal & cleaning"

http://www.peachparts.com/shopforum/showthread.php?t=92826

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1982 280E 248k km - workhorse...
1977 300D 268k km - just completed engine swap
1974 280SE 164k km - side-swiped by a bus...
1977 300D 198k km - manual trans, built in South Africa - written-off by a Landcruiser..
1977 300D 489k km - written-off by my 82 yo mother!

It's not commonly done, but you can make biodiesel out of straight animal fat. The fatty acids get modified the same way as the ones from vegatable oil.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.