His problem seems to be happening in the fuel line system before the stop lever. The stop lever is an injection pump device, and he's not getting fuel even to the filters.

So its got to be bad fuel pump, or more likely bad fuel line, clogged fuel strainer in the tank, or clogged vent, or out of fuel, as previously mentioned.

You can test the fuel pump by providing a supply of diesel from a jar with a section of fuel line pushed down in it, and then connected to the pre-filter. Or a can of diesel purge would work too. If it comes to that - this might not be the desireable first test.

More important to verify fuel level and lines.

Ken300D

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