There is no need to worry about the inner tubes being mis-aligned. Those inner tubes are the idle circuit feed tubes, and the necked down section at the bottom forms the idle feed restriction, or jet. Idle fuel is drawn from the main well through the idle jet and emulsified with air from the main idle bleed. The main idle bleed is located high up on the booster assy, facing inward towards the throttle bore.
This very rich air fuel mixture then moves outboard, at a downward angle towards the idle down passage. The brass restrictions you see in the outermost holes of the booster assy is the idle channel restriction. It's function is to limit the total amount of the rich air fuel mixture delivered to the engine through the transfer holes just above the throttle plates. After the emulsion passes the idle channel restriction but before it enters the idle down passage in the main body, additional bleed air is introduced through an angled passage drilled from the outer edge of the booster assy. This bleed also act as siphon breaks which will cause fuel flow to stop once vacuum in the idle circuit drops below a calibrated level.
Thus endeth idle fuel flow through the booster assy. Further trimming to the idle fuel flow occurs at the transfer ports in the main body, but that is outside this examination of booster fuel flow.
Note, both primary and secondary boosters have idle systems, but as a rule, secondary boosters do not have idle channel restrictions. I will go into the reason for this in a future posting.
As you are most likely aware, this circuit handles the fuel delivery for more than just idling. Small changes here make a big difference in the fuel delivery to the engine. Stay tuned for more information on the function of the various tubes and restrictions contained in the booster assy.
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