Avoiding Fuel Flow Restriction; Low Permeation Fuel Hose Requirement; Epa Pressurized Portable Fuel Tank Requirements; Fuel Demand Valve (Fdv) Requirement - Mercury 150 Operation, Maintenance And Installation Manual

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.

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.
The fuel demand valve has a manual release. The manual release can be used
(pushed in) to open (bypass) the valve in case of a fuel blockage in the valve.
a
FUEL AND OIL
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b -
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Fuel demand valve ‑ installed in the
fuel hose between the fuel tank and
primer bulb
Manual release
Vent/water drain holes
eng