When looking over my 1983 johnson 15, i grabbed ahold of the fuel line that is at the left hand side of the fuel filter cover on the left side of the motor. A small amount of gas squitred out. I am afraid to further tighten the knurled knob to more tightly fit the black cover against the mesh filter. Is this normal or should i try to make it even snugger? I am afraid it will crack. Bob