I have re-routed the fuel lines on my Matrix. I did it because I do not like my fuel lines to wrap around the engine head. You probably have a air leak some place. Air leaks can be a "*****" to find. If you can not get it worked out, simply call Cen and send in your buggy with reciept. I'm sure they will take care of the problem. I know that may take a week and half out of your rc fun, but it can eliminate a lot of the headache.