You don't. At full "throttle" that IP is mechanically forced open, I think, and it's gonna smoke because you are overfuelling it. No smoke if you let the vacuum governor do it's job, but no power, either.

Make sure the diaphram is in good condition (it probably is, because the engine speeds up when the vac is released, and try to avoid absolute full throttle use.

You can adjust it to not smoke at altitude, but it will then have low power at sea level. This can be done with the max fuel delivery adjustment, but I don't know where it is on this IP.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!