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SECTION - 4
Description
Minimum fuel line diameter on single‑engine gasoline
installations
Minimum fuel line diameter on multi‑engine gasoline
installations
•
On Multi-Engine Gasoline Installations: Use a fuel pickup and fuel tank supply line for
each engine. If a single pickup and fuel tank supply line is used, the line must be 13 mm
(1/2 in.) ID or larger.
•
In addition to increasing restriction, long fuel line lengths and the use of numerous fittings can
increase the fuel inlet temperature to the engine by absorbing heat from the engine
compartment. Use the Fuel System Pressure and Temperature Test to determine if fuel
pressure and temperature are within an acceptable range. If temperature is excessive, it will
be necessary to reduce the fuel line length and/or the number of fittings or to insulate the
components.
•
Fuel lines should be routed as low as possible in the engine compartment to keep them in the
coolest region. Temperature increases significantly with increased engine compartment
height.
•
The slope of the fuel line should be kept as consistent as possible to avoid high spots that can
trap vapor and contribute to vapor locking problems.
•
Holes where the lines run through the bulkheads should be carefully rounded off or protected
with grommets to prevent damage from vibration and chafing.
•
The fuel line should be installed free of stress and firmly secured to prevent vibration and/or
chafing. Clamps used to secure the line should not pinch or kink the line.
•
Sharp bends in the fuel line should be avoided.
•
A flexible fuel line must be used to connect the fuel supply line to the fuel inlet fitting on the
engine to absorb deflection between the engine and the hull structure when the engine is
running.
90-899883183 DECEMBER 2007
FUEL SYSTEM
Specification
10 mm (3/8 in.)
13 mm (1/2 in.) ID or larger
Page 5 / 6
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