Check under both lids to make sure the rubber seals are postioned correctly. You might try wetting your finger tip with fresh oil and applying a thin film on the seals as well. Tighten with Gorilla grip (as much as possible with your hands) but not with a tool as you could distort the lid.

Other than that, check the areas where the clear hose connect, make sure they are tight, if you can twist these easily you may need to apply moisture (soap?) as well.

Only other thing I can think of is possibley a defective pump?