The gunk could be some of the assembly grease on the inverted cone shaft set hard etc, OR sometimes some diesel etc will leak in the the well, and then bacteria etc will grow over time. Also, due to oil mist through the intake system and intercooler etc, some will get blown through the pressure line into the pump top chamber whee the diaphragm is.
JC
The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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