2003 Johnson ST 55 HP WRL 2 Stroke Commercial Service Manual, PN 5005483, Page 41Get this manual
INSTALLATION AND PREDELIVERY FUEL SYSTEM REQUIREMENTS
FUEL SYSTEM REQUIREMENTS
Overview
Fuel systems must meet the minimum specificationsThese requirements must be met to insure the proper delivery of fuel to the outboardThe guidelines established by the ABYC and U.SCoast Guard should always be followed Permanent fuel tanks must be properly vented outside of the hull Remote fuel tank gas fills must be grounded Permanent fuel tank pickups should have the correct anti-siphon valve installed to prevent fuel flow if leak occurs in the fuel distribution systemRefer to ABYC Standard H-24
Fuel System Primer
Outboards require priming system capable of refilling the fuel system subsequent to periods of non-use
Primer Bulbs
Primer bulbs that meet the outboard's minimum 1.0fuel line requirements are used on most outboardsInstall the primer bulb in the fuel supply hose as follows: The primer bulb should be installed in an accessible location The arrow on the primer bulb must point in the direction of fuel flow The fuel primer bulb must be positioned in the fuel supply hose so the primer bulb can be held with the arrow pointing "up" during priming