im trying to collect samples from some pumps which seem to have adulteration (im fed up with the inconsistent kmpl figures on my bike now).
the fuel i took yesterday seems to have residual matter (black-gray sticky matter) and its clogging the fuel - leadout from the tank (aka the fuel knob) , opened the knob bottom and flushed the fuel out.
what could be this black sticky matter :?


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I had just topped up. Any idea about Premium Fuel...?

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