If it still has problems with the fuel tank bypassed you may have a plugged catalytic converter. Try removing the small pipe that connects the EGR to the intake manifold and then opening the EGR valve with a mityvac and see if that helps.

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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!)

'95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs)

Deuteronomy 22:4-
"Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again."