I am asking for clarification on how fuel moves through the cap of the accelerator pump. I made a crude photo to help. The little brass tube (#3) under the cap of the accelerator pump is blocked on my pump. When I spray carb cleaner through one of those micro-straws into the small brass tube (#3), no cleaner enters the hole, it sprays back. Neither does spray cleaner enter the hole on the rim (#2). Fluid sprayed into the rim hole (#2) sprays back also. The other rim hole (#1) goes to a hole under the cap (#5) and it is wide open. Piecing together what I can, it seems gas flows by gravity into hole 2 then fills the space below the diaphragm through either 3 or 4 (or both?). I can't tell on mine (since the passages are blocked). When the diaphragm is pressed downward, I assume gas is pumped through hole #5 up to the tube carrying a bit of gas to the two nozzles near the choke flaps. Is this correct? If it is, why there are two passages to fill the chamber below the diaphragm? (3 and 4). Thank you, and apologies for any redundancy. I have read similar posts but can't find an answer to my specific question. Either I was not patient enough or searched poorly.
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