Unless your pump has started pumping engine oil with your fuel, or one injector sleeve goes through an oil passage, it is likely a leaking injector. Partly burned diesel is a black, sticky liquid that at first looks like dirty engine oil. As the leak gets worse, it will build up and form a very hard, shiny, sticky layer of black ooze that will spread outward from the injector. It is EXTREMELY difficult to remove (chisel, screwdriver, putty knife, and lots of chemical cleaners). I let it go a year before I cleaned the sleeve and replaced the injector and brass sealing washer and it took 10X longer to clean than it did to replace the injector.
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