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  #1  
Old 12-04-2012, 03:26 PM
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What happens to soot in fuel supply?

Transferred some diesel from one car to another using my fluid evacuator. But, the evacuator had previously been used to change engine oil, so the residue from the evacuator made the fuel black. Would the soot (the cause of the blackness) be filtered out by the main fuel filter? Or would it make it past the main filter into the injection pump? And, if so, could this small amount of soot do any harm?

BTW I later learned that you shouldn't use a fluid evacuator for any fuel.
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Old 12-05-2012, 03:25 AM
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It is difficult to tell if it will make it through or not with out running it.

If you happen to see a blackening of the clear pipes past the primary filter then you know you haven't been lucky! I wouldn't risk it. I'd be draining the fuel from the system and cleaning it all out but then I'm probably someone who worries more than he should...

...some people are known to run a diesel with a lot worse fuel than what (I think) you've described.
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  #3  
Old 12-05-2012, 04:23 AM
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Answer

Quote:
Originally Posted by shertex View Post
Transferred some diesel from one car to another using my fluid evacuator. But, the evacuator had previously been used to change engine oil, so the residue from the evacuator made the fuel black. Would the soot (the cause of the blackness) be filtered out by the main fuel filter? Or would it make it past the main filter into the injection pump? And, if so, could this small amount of soot do any harm?

BTW I later learned that you shouldn't use a fluid evacuator for any fuel.
No, it will do no harm in that volume.

You where dis-informed the fluid evacuator is OK with diesel.

Simple logic please, they call it fuel OIL because it is light oil used as fuel = if it can be used to remove engine OIL, the answer is ....

Note: Gasoline can eat the plastic/rubber on many suction units..

.
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Old 12-05-2012, 04:35 AM
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it will do little harm, I'd not be concerned in that volume, but no, the fuel filtration system will not even notice the soot. it'll pass right through as air would through an open window.
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Old 12-05-2012, 07:01 AM
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Thanks....yeah, I would assume that a filtration system would be designed in such a way that anything that could pass through it is harmless, at least in small quantities.
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  #6  
Old 12-05-2012, 07:14 AM
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From my oil analysis guy:

I would not be too concerned about it. There are some trucking companies that utilize spinner oil filters and run used diesel engine oil back through the fuel once the large particles have been filtered. Let your filter do its job, and any soot that is passed through the media would be no worse than ordinary dirt that will pass through, the good news is the fuel will actually solubilize most of the carbon particles. Soot is hard carbon, although a great deal of it will dissolve and actually burn quite well. There is really not much you can do but run it through, and I doubt you will have too many problems, but you may want to consider servicing the filter element once the blackened fuel has been consumed.
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91 300D "Otis", Smoke Silver, 123k mi, other DD
98 E300 "Murray", Silver, 123k mi, Stage 2 Rocketchip chip tuned, son's DD

Twelve other MB's owned and sold
2002 Honda Odyssey 230k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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