Abstract: A molded plastic spray guard for a fuel tank vent head of a boat has an inner wall and an outer wall joined by a peripheral wall of U-shaped configuration with a slot extending forwardly from the rear edge of the inner wall to be fittable over a vent line adjacent the hull of a boat between the hull and vent head mounted on the end of the vent line which clamps the spray guard in position. The vent head is consequently protected against contact from spray resultant from operation of the boat to which it is connected but is capable of venting rearwardly through a rearwardly facing opening in the spray guard.