1.6 Oil fuel transfer Transfer pumps draw from the oil mains, from overflow and drain tanks and from the oily bilges-parts of the engine and boiler room bilges separated from the remainder by coamings-to which oil spillage is led e. The pumps discharge to settling tanks the oily water separator and the oil mains1.6 Oil fuel transfer • Transfer pumps draw from the oil mains, from overflow and drain tanks and from the oily bilges - parts of the engine and boiler room bilges separated from the remainder by coamings - to which oil spillage is led. • The pumps discharge to settling tanks, the oily water separator and the oil mains