Lubrication reduces friction between moving components thus to prevent wear and provides a measure of water resistance to prevent corrosion. When lubricating greasable points, always use a marine type waterproof grease. It is important to keep these cables well lubricated to prevent corrosion from forming inside the casing. If corrosion forms, it is almost impossible to remove and the cable must be replaced. Check with the manufacturer of your control cables if you are unsure.
Most boats have at least two fuel filters.
The first filter should be mounted between the fuel tank and the engine. This unit may be a combustion fuel filter and water trap. The second unit should be an inline filter mounted on or near the engine. These are usually similar to automotive style filters, consisting of a filter element in a housing with nipples on either end to attach the fuel lines. A burst hose or a slipping belt can strand you on the water quickly.