I think you should be prepared to cut the line between the spin-on fuel filter and the injection pump. If you cut the fuel line at the pre-filter, then the engine still has the fuel supply in the big spin-on fuel filter.

You'll get more of a mess of diesel fuel because the fuel pump will still be able to pump fuel through the spin-on filter. But the engine should stop sooner.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles