Re: Fuel Tank Venting

[Thomas R Hansen <trandco1@xxxxxxxx>]

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> Now I'm wondering if I need to use a vented cap? Without a vent line,
will a 
> sealed cap work with the non-vented tank? What happens to the gas if 
> it expands in the heat, or what happens when you use fuel up and 
> draw down the tank? What stops the tank vacuum from collapsing, 
> etc?
> 
> Thanks,
> Terry Lynch
> St. Petersburg, FL
 Terry, 
A vented cap allows air to be drawn into the tank. Your filler neck is
located near the top of the tank, right? No gasoline will expand from the
heat of the day, to a point where it will pass through the cap. You may
hear a little gas pass when you loosen the cap at fill-up, but most
times, that pressure gets used up when running. Your non vented cap may
starve the carb, like a clogged filter would, eventually.  Tom in Dallas

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