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Goon gas tank


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L20B motors had a fuel return line, but I don't think others did. It may be the tank vent that eventually connects to the PCV valve to draw away and burn the fumes. On later cars a charcoal cannister was used to store fumes when the motor wasn't running.


If it's a fuel supply line then it should be submerged and will bubble if you blow in the end. If it doesn't then it's likely a vapor vent.

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