6.1.6 The fuel fill point shall be so located and arranged that no overflowing fuel can enter the craft when it is in its static floating position, except outboard and diesel engine powered craft which may have fuel fill and ventilation inside the craft if all the following requirements are fulfilled:
- Outboard powered open craft without accommodation space or enclosed spaces;
- Continuous floor, liquid tight to hull interior, i.e. bilge compartments with engines, electrical components, batteries etc;
- Floor above waterline in fully loaded, ready to use condition;
- Fuel fill and vent openings are above floor;
- Fuel spillage drains overboard naturally.
6.1.7 The fuel fill system shall be designed to avoid blowback of fuel through the fill fitting when filling at a rate of 30 l/min, at between 1/4 and 3/4 full of the tank capacity. For fuel tanks of 100 l capacity or less the fill rate may be
reduced to 20 l/min.
6.1.8 The fuel fill point shall not be located within a 400 mm horizontal radius of any ventilation opening, nor vertically above this radius, except where the craft's coaming, superstructure or hull creates a barrier to prevent fuel vapour entering the craft.
6.1.9 The fuel fill point shall have a label or symbol as described in ISO 11192 that identifies the type of fuel that shall be used.
6.2.2 Vent hoses located in the engine compartment shall be fire-resistant, type A1 or A2 hoses according to ISO 7840. Other vent hoses shall be either type A1 or A2 in ISO 7840, or type B1 or B2 in ISO 8469.
6.2.3 Each fuel tank shall have (a) separate vent line(s).
6.2.4 Vent lines shall not have valves other than those that permit free flow of air and prevent flow of liquid (fluid) both in and out of the tank.
6.2.5 Vent lines shall be self-draining when the craft is in its static floating position.
6.2.6 The vent-line termination shall be remote and not less than 400 mm from any ventilation opening through which fuel vapour may enter the craft.
6.2.7 The vent line shall have provisions to minimize intake of water without restricting the continuous release of vapour or intake of air and shall not allow fuel or vapour overflow to enter the craft.
6.2.8 The vent line connection shall be at the highest point of the tank as installed in the craft.
6.2.9 The vent line connection on the craft shall be mounted as high as practical or fitted with a "goose neck″ to minimize accidental spillage during fuel filling.
6.2.10 The vent lines on all fuel installations shall incorporate a flame arrester screen/net, not reducing the area below the effective vent pipe area.
6.3 Fuel distribution lines and fuel return lines
6.3.1 Rigid fuel distribution and return lines shall be connected to the engine by a flexible hose section. Support must be provided within 100 mm from the connection to the metal supply line on the rigid side of the connection.
