I know this is an old thread but I have exactly the same problem. Brm wide mouth filter with Olympic blue orings. Filter changed 7000 mi ago. Fuel started spraying straight forward from under the cap. Screws were all tight. Took cap off fiddled with big green oring. Put back and stopped leaking. Two days later same thing. Take off cap, put it back on. Start it, stops leaking until you shut it off then on startup it spews out again. Got new filter but for quick change just changed orings. Lasted probably 200 mi. with 5 or 6 start-ups. Now leaking again. Any ideas? Screws all tight. Anything else that would cause too much pressure in housing?