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FUEL SYSTEM
2. Using a digital vacuum gauge, measure the vacuum at the engine's fuel inlet. The maximum
measured vacuum at the engine's fuel inlet must not exceed 6.9 kPa (2 in. Hg) through out
engine operating range.
IMPORTANT: Vacuum reading higher than specified can cause vapor locking with some of today's
fuels. It can also cause poor engine performance because of fuel starvation.
3. Use fuel lines that are Coast Guard approved (USCG Type A1).
Description
Minimum fuel line diameter on single‑engine gasoline
installations
Minimum fuel line diameter on multi‑engine gasoline
installations with single pickup and line
4. On multi-engine gasoline installations, use a fuel pickup and fuel tank supply line for
each engine. If a single pickup and line is used, the line must be 13 mm (½ in.) ID or larger.
5. On installations that require long lines or numerous fittings, use the fuel lines and fittings
with an ID greater than 10 mm (3/8 in.).
6. Install the fuel lines so they are free of stress and firmly secured to prevent vibration and/or
chafing.
7. Avoided sharp bends in the fuel lines.
8. Use a flexible fuel line to the fuel inlet fitting on the engine to absorb deflection when engine
is running.
SPECIAL INFORMATION ABOUT ELECTRIC FUEL PUMPS
Improper boat design and construction may result in serious injury or death. Adhere to all
applicable marine regulations (United States Coast Guard [USCG], European Union–
Recreational Craft Directive [EU‑RCD], etc.) and the standards they reference (American Boat
and Yacht Council [ABYC], Society of Automotive Engineers [SAE], International Standards
Organization [ISO], etc.) when designing and constructing the boat and other components, such
as the engine compartment, fuel delivery system, or exhaust system.
The installation of additional filters may cause:
•
Fuel vapor locking.
•
Difficult warm‑starting.
•
Piston detonation due to lean fuel mixture.
•
Poor driveability.
Fuel Lines and Fittings
•
U.S. boating standards and regulations specify the sole use of USCG Type A1‑15 fuel lines
in the engine compartment or in any location in the boat where a break in the line could result
in a discharge of 150 cc (5 oz) of fuel in 2‑1/2 minutes.
•
To meet 2007 California Air Resources Board regulations, any boat manufactured for sale,
sold or offered for sale in California, or that is introduced, delivered or imported into California
for introduction into commerce must use low Permeation Fuel Hose from the primary
connection of the fuel tank to engine.
•
Low Permeation Fuel Line Hose is USCG Type A1‑15, defined as not exceeding 15 g/m²/24
h with CE10 fuel at 23° C as specified in SAE J 1527—Marine Fuel Hoses. For more
information refer to California Regulations for 2007—Low Permeation Fuel Hose
•
The minimum fuel line and fitting sizes should be used. Larger sizes may be required on
applications with longer fuel lines or numerous fittings.
Page 4 / 6
13 mm (½ in.) ID or larger
WARNING
!
SECTION - 4
Specification
10 mm (3/8 in.)
90-899883183 DECEMBER 2007
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