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Black smoke

Fuel System

Vehicle Information: Year: 1979; Engine (Size, Modifications): 3.3; Total Mileage: 64000;

I'm having problems finding what is wrong with my 930. While driving it will bellow black smoke under hard accleration. It cranks fine hot or cold and idles fine although somewhat low around 700 rpm. I did do a fuel system check, with air temp at 85 deg F. the results are as follows:2.4 bar cold pressure3.9 bar warm pressure5.6 bar system pressure1.6 bar rest pressure after 20 min. I have had mechanics suggest that the warm up regulator MAY be bad, but I really hate to buy one and it not be the problem. Any suggestions?Lane

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