just looking at your schematic it looks like all the WVO components are just bolted in and not integrated. You can do it it in bits by just removing the return valve and feed valve and reattach the fuel line back to the IP close to the way it was before. don't forget to reprime the fuelfilter if you spill alot of D. and next weekend cap off the heaters and remove the rest. I'd be interested in your WVO tank to turn it into a small transfer tank.

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1993 MB 300D 245K died.