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Message: <blockquote data-quote="venom" data-source="post: 1098212" data-attributes="member: 9290"><p>The vent is used to let vapor out when you are filling up and let air in when your pump is running.  On a stock car it's routed to a charcoal canister then back to the motor.  If the vent is mounted too low or size is too small your pump will burn out .  Think about sucking a 2 liter bottle you will get to a point where its real hard to suck any more.  Now if you open up the end of the bottle with a hole you can SUCK as much as you want lol.   Vent should be the higest point of the  gas tank.  Keep in mind  to loop the line in a circle and mount the filter as high as possible.  My filter is a bit on the big size but its a k&n that I had laying around so might as well use it.  You can also install a roll over valve and keep the stock switch in the trunk that turns off pump in case of a crash.</p></blockquote><p></p>