For a Cessna 182P 1972 (sorry no picture...yet) During my preflight i always first: check both tank levels, sump both tanks, check oil and oil cap and then start the walkaround routine. Next, while walking around i noticed a small fuel puddle under the pilot side wing sump. I used the sump tester to excercise it up and down a few times and now its dripping much more slowly, maybe a drip per 5...10 minutes. The temp was about 4deg above freezing...doesnt seem like ice. It seems like the spring actuated whatever isnt coming back down perfectly straight or just not enough force or whatever gasket or seal must be going. I want to cap it off to be 100 percent sure it wont leak while were away from the plane. As long as i sump before flight, i should also be able to fly with it capped off...right? If anyone has had to cap theres off, do you have a recommendation for a plumbing style cap that would fit those outter threads? Im just thinking something i can hand tighten until i get it fixed...which will require a flight.