Bob,
Here are a couple that show the intake to the pump.
The second one shows the all important small vent line (brownish red)
from the front of the engine back to the top of the pressure can.

Paul Lamar

  The 20 b has a small vent line hole there also. Very important to me since
I have a taildragger.  Now I know where to run it to.

Barny
MGDQ 20bt

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