Were I to guess, the vent has to be on the opposite side to the filler spug.
In the first example , the filler is the plunger, and in the second example, a filler plug is added to the right tank.
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Charles Fitton
Maryhill On.,
Canada
too many carriers
too many rovers
not enough time.
(and now a BSA...)
(and now a Triumph TRW...)
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