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gas tank vent lines

1974 Views 2 Replies 3 Participants Last post by  Dean
I am puttting a gas tank on a 69 and i'm not sure what is need on the two vent lines. Do you leave them open or plug them with a certain vent part.
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I heard that if you plug the vent line, vaccuum caused from the pump sucking gas out of the tank can collapse it.

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1979 Chevy Malibu with a mild 355.
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