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Old 02-26-2010
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More importantly, what happens when you are running from a full tank and you forget to open said vent... and the engine dies just at the worst possible moment... and then you have to bleed the fuel lines to get the thing to work again... and if you've got a really good fuel pump, what happens if you drop the volume of the tank enough and the atmosphere decides to help you out—applying 14 lbs per square inch... If the top of the tank is 20" x 15" that's an awful lot of pressure.
Quote:
Originally Posted by Bene505 View Post
CD's just making sure we are awake.

If you fill your tank from a marina with a (cold) underground fuel tank on a hot day, the fuel will expand soon after. And with a full tank, there will be relatively little air above the fuel to absorb that fuel expansion (via an increase in air pressure). So the pressure in the tank will get pretty high until BANG you burst your very full fuel tank.

(BANG added for emphasis and color. Haven't really ever burst one of those, they may go BURP or CLANG for all I know.)

Regards,
Brad
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