Why do pump action oil cans leak? I have two that both mysteriously accumulate oil over the outside and onto the shelf where they are kept. I initially thought changes in air pressure were causing the oil to vent via the spout, but having drilled vent holes in the bodies the oil still comes out, so that can't be the reason. I now store them on a bucket lid to prevent contamination of everything around them, but surely there's a better solution.
Cliff Coggin.