The 1904 is an
archaic design . An example of something still useful but considered
obsolete. The 'weep hole' mentioned is simply the open fuel bowl vent on the carb top . The 1904 fuel bowl vent has only minor baffling to prevent fuel from leaking when sloshed around with cornering and braking. Some 1904's have a
stone filter type added baffle to prevent
too much fuel escaping but still the vent is often wet if not weeping. The 1904's design is from an era when a little fuel and fuel vapor escaping wasn't an important design concern.
Any fuel contamination at the inlet needle will usually cause immediate flooding on shutdown. As mentioned, a fuel pressure regulator can help prevent excessive pressure from forcing open the fuel float needle and contributing to this problem .
If you have a glass fuel bowl featured 1904, you can observe where the fuel level averages when idling and under increased pressure when revved'.
My experience has been to keep fuel level / float level / needle setting - as low as possible without reducing performance but the fuel level still rises on shutdown and still sloshes around and weeps out with any
spirited driving.
( .. Original fuel bowl gaskets are cork/rubber and have continuous trouble with keeping the fuel bowl gasket sealed over time with 'modern' 10% solvent alcohol spiked gasoline. creating suitable alc/gas proof bowl gaskets remains a challenge with the 1904's.)
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