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Old 09-23-2009, 12:23 AM
Thelastboyscout's Avatar
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Join Date: May 2008
Posts: 11
1983 300D Oil in the diesel fuel

Forum Gurus,
I searched for threads with this issue and only found reverse threads (diesel fuel in the oil). I just recently changed out the lines coming from my fuel tank as the one had been leaking for a while. I've also gotten some smoke on start up, a little rougher starting up than it used to. There is also some smoke that stinks even after the temperature is warm/hot.

Things were confirmed after checking my fuel filter and the drained diesel that came out when I changed fuel lines - it's got a dark hue/tint. It appears my oil is somehow mixing with the diesel.

I'd like to remedy this. Can anyone point me to an existing thread or post a reply with some direction so that I can fix my 83 300D?

Thanks - The Last Boy Scout and Quirky '83 300D and The Martyr '82 300D
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Old 09-23-2009, 02:41 AM
Diesel911's Avatar
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Join Date: Sep 2007
Location: Long Beach,CA
Posts: 25,208
Black coloring to Diesel Fuel can be caused by:
Worn out Fuel Injectors allowing combution gases to pass by the Injector Nozzle Seats allowing carbon to get into the diesel fuel returning to the Fuel tank.

Something growing in the Fuel Tank. If you put in something to kill it be prepared to change your filters as they are going to pug often until all the dead bodies are out of the Fuel (or remove the Fuel Tank and have it cleaned before treatment).

I do not know if your year and Model Fuel Supply Pump has an O-ring in the drive rod to seal it or not. But, there was a recent thread where it was found the Oil the lubes the Fuel Injection Pump Camshaft was being sucked past the O-ring and into the Fuel Supply Pump. But this was in a 90 something later model that also exibited some Oil loss.

You could get another Fuel Supply Pump from the Junk Yard and swap it out.
84 300D, 82 Volvo 244Gl Diesel
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