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We're still not fully clear how the auxiliary fuel system connects. The photos above show the rotating cap with the rubber seal that is being called the top of the auxiliary fuel adapter. One photo with the lever down, the other with the lever up. Up reveals a fuel connector fitting. The cap does not appear to be removable without disassembly. The TM, and I checked the 1977 and 1988 editions, do not mention or illustrate this cap. What's its function? What would that fuel connector fitting go to?
So far as TM illustrations, it would appear, though the manual doesn't describe this, that the lower elbow on the auxiliary fuel pump is what connects to a flexible line to an auxiliary fuel supply. Makes sense for that intake to be on the fuel pump.
Could there be yet another manual for the 003A dedicated to connecting to a fuel supply? In addition to the obvious things it would include specs such as fuel line lift height limits, and pipe diameter recommendations. Just because it looks to my eyes like it takes a 3/8" line doesn't mean it does.