Fuel System - Mercury 150 Operation, Maintenance And Installation Manual

OUTBOARD INSTALLATION
The remote control connected to the outboard must be equipped with a start in
neutral only protection device. This prevents the engine from starting in gear.

Fuel System

AVOIDING FUEL FLOW RESTRICTION
IMPORTANT: Adding components to the fuel supply system (filters, valves,
fittings, etc.) may restrict the fuel flow. This may cause engine stalling at low
speed, and/or a lean fuel condition at high RPM that could cause engine
damage.
ELECTRIC FUEL PUMP
The fuel pressure must not exceed 28 kPa (4 psi). If necessary, install a
pressure regulator.
LOW PERMEATION FUEL HOSE REQUIREMENT
Required for outboards manufactured for sale, sold, or offered for sale in the
United States.
• The Environmental Protection Agency (EPA) requires that any outboard
manufactured after January 1, 2009, must use low permeation fuel hose
for the primary fuel hose connecting the fuel tank to the outboard.
• Low permeation hose is USCG Type B1‑15 or Type A1‑15, defined as not
exceeding 15 g/m²/24 h with CE 10 fuel at 23 °C as specified in SAE J
1527 ‑ marine fuel hose.
EPA PRESSURIZED PORTABLE FUEL TANK REQUIREMENTS
The Environmental Protection Agency (EPA) requires portable fuel systems
that are produced after January 1, 2011, for use with outboard engines to
remain fully sealed (pressurized) up to 34.4 kPa (5.0 psi). These tanks may
contain the following:
• An air inlet that opens to allow air to enter as the fuel is drawn out of the
tank.
• An air outlet that opens (vents) to the atmosphere if pressure exceeds
34.4 kPa (5.0 psi).
FUEL DEMAND VALVE (FDV) REQUIREMENT
Whenever a pressurized fuel tank is used, a fuel demand valve is required to
be installed in the fuel hose between the fuel tank and primer bulb. The fuel
demand valve prevents pressurized fuel from entering the engine and causing
a fuel system overflow or possible fuel spillage.
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