57 f100 fuel tank vent?
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It is important to run a vented cap as the vent is supposed to have a rubber flap that closes to keep the gas in the tank should you wind upside down in the ditch. However, once when I had a painted non-vented cap that matched the truck I drilled a 1/32 hole in an area that didn't show.
It worked as a vent, never had any problems - but I always keep the shinny side up on that truck.
It worked as a vent, never had any problems - but I always keep the shinny side up on that truck.
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