If you leave the lube tank filled with oil you find it has leaked out when the saw is not in use. As time permit's I plan to look for cracked tank? Could there be a check valve or something else dirty or broken? The saw does pump bar oil when running.It would be easy enough to flush pump system with solvent and blow-out with air. I'm a small engine Fowley-Belsaw want to be trying to get ready in case another storm come's Flordia's way.Thanks ahead of time.