My fxr has developed a fuel leak that gathers on the black plastic, "L" shaped fitting between the 1/4" fuel line and the left side of the carb body. fuel gathers and will do a slow drip if left running and sitting.Will "blow/dehydrate" off when moving. can anyone tell me how to remove and replace this fitting. Also is there a o-ring involved, does it screw in/out. ?