A lubricant delivery system for an outboard motor that includes a lubricant storage tank positioned in the hull of an associated watercraft and a lubricant delivery tank carried by the outboard motor. A switching arrangement supplies lubricant to the delivery tank when its level falls below a predetermined amount and shuts it off when the lubricant level reaches a predetermined amount. The outboard motor is mounted for trim adjustment and a trim sensing arrangement is incorporated for sensing when a change in the trim of the outboard motor might effect needless actuation of the lubricant pump and cause overfilling of the lubricant delivery tank.