you need a one way valve in the breather (s) as to how many beathers it depends on how your tanks are tubed up! - the one way valve is to let air in but not petrol out if you roll the car in a crash! I am`setting up a secondary tanks for my toy the only issue I have is the normal breather seems to be blocked at the moment! - aparently this happens a lot! with old cars and road gunk getting in there or waxoil etc!


earls make the bits you need