GASOLINE ENGINES SKI MODELS
Page 11 of 48
The following, but not limited to the following, additional fuel connection related points, ap-
plying to all engines unless otherwise stated, must be considered [Refer to boating stan-
dards (NMMA, ABYC, etc.) and Coast Guard regulations for complete guidelines]:
1. Fuel tank should be mounted below carburetor level (if possible) or gravity feed may
cause carburetor fuel inlet needle to unseat and flooding may result.
2. On Gasoline Engines: The maximum measured vacuum at the engine’s fuel inlet must
not exceed 2 in. Hg (6.9 kPa) at idle rpm, 3000, full throttle rpm, and back at idle rpm.
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. Fuel pickup should be at least 1 in. (25mm) from the bottom of fuel tank to prevent pick-
ing up impurities.
4. Fuel lines used must be Coast Guard approved (USCG Type A1).
Diameter of fittings and lines must not be smaller than 5/16 in. (8 mm) I.D. on 350 cid / 5.7L
and Black Scorpion engines.
Diameter of fittings and lines must not be smaller than 3/8 in. (10 mm) I.D. on 377 cid / 6.2L
engines.
5. Larger diameter (than previously specified) lines and fittings must be used on installa-
tions requiring long lines or numerous fittings.
6. Fuel line(s) should be installed free of stress and firmly secured to prevent vibration and/
or chafing.
7. Sharp bends in fuel lines should be avoided.
8. A flexible fuel line must be used to connect fuel supply line to fuel inlet fitting on engine
to absorb deflection when engine is running.
SPECIAL INFORMATION ABOUT ELECTRIC FUEL PUMPS
CAUTION
The electric fuel pump and factory installed water separating fuel filter have been
carefully designed to function properly together. Do not install additional fuel filters
and/or water separating fuel filters between fuel tank and engine.
The installation of additional filters may cause:
• Fuel Vapor Locking
• Difficult Warm-Starting
• Piston Detonation Due to Lean Fuel Mixture
• Poor Driveability
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