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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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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