Quote:
Originally Posted by Govert
The primer pump could also be leaking engine oil into the fuel system, turning the fuel blackish.
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That is Close; it is the little O-ring in the Fuel Supply/Lift Pump that goes bad. When that happens some Members have had the Oil inside of the Fuel Injection Pump get sucked into and mixed with the Fuel inside of the Fuel Supply/Lift Pump.
If your Injector Nozzles are extremely worn or the Spring inside is broken (that would cause a miss) it is also possible for combustion gasses to get into the returning Fuel.