Fuel Tank - Roll Over Valve Feb 21, 2019 16:09:15 GMT via mobile Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by scooby1929 on Feb 21, 2019 16:09:15 GMT Guys have replaced my fuel pump and have noticed that I had previously blanked off the roll over valve. Not sure this is a great idea. Am I best to put on a one way valve and then add a small cannister. What's everyone else done??