My 106 looses fuel through the fuel tap on the sediment bowl type filter. I have replaced the seal for the glass bowl however I think it is loosing fuel through the brass screw type shutoff. If there is fuel left in the tank after mowing it is gone the next time I need to mow. Is there a seal or o ring or something that I can repair or do I have to buy a whole new sediment bowl valve assy. At todays gas prices it needs fixed soon!