Just curious if it's necessary to have? thanks!

 

It's required by EPA for gasoline evaporating from the tank. Since sometime in mid-'70s ALL emmisions are included, not just the tailpipe.

If you plug it all up, you need to vent your gas tank somehow. Before EVAP systems, the gas cap had a small vent like the one in your lawnmower. It's probably not worth the effort, because I don't think the EVAP system hurts performance anyway.

 

It is extra weight and space in the engine compartment though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">It is extra weight and space in the engine compartment though.</TD></TR></TABLE>

You'd lose more weight by taking a good dump before you drive.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Perfectionist &raquo;</TD></TR><TR><TD CLASS="quote">

You'd lose more weight by taking a good dump before you drive.</TD></TR></TABLE>

LOL, that could be true, but I see alot of people taking USEFUL things off that weight less than that even.

 

Nope. Took mine out when I dropped a jdm engine in. The tb doesn't allow for one. I just put a check valve on the line that normally vents the gas tank.