Marinediesel 5L V8, Owner'S Manual, Page: 187 / 248

Owners Manual 185 Section 3 - Engine
Fuel Tank Bottom Versus Fuel Inlet Height
(Measured from bottom of fuel tank to height of fuel inlet fitting.)
Less than 20 in. (< 508 mm) Not generally a problem
20-40 in. (508-1016 mm)
May be suspect of causing fuel delivery
system problems.
Greater than 40 in.(> 1016 mm)
Could cause fuel delivery system
problems. Avoid if possible.
Fuel Lines
The following, but not limited to the following, additional fuel connection related points,
applying to all engines unless otherwise stated
, must be considered. Refer to boating
standards (NMMA, ABYC, etc.), Coast Guard regulations and/or your countries
regulatory agency for complete guidelines.
x Fuel lines used must be Coast Guard approved (USCG Type A1) and meet the
following size specifications according to engine model: All Models must not be smaller
than 3/8 in. (10 mm) I.D.
x Return lines used must be Coast Guard approved (USCG Type A1) and meet the
following size specifications according to engine model: All models must not be smaller
than 5/16in (8mm) I.D. preferably 3/8in (10mm) I.D.
x
On Multi-Engine Installations:
It is best to use a fuel pickup and supply line for
each
engine. If a single pickup and line is used, line must not be smaller than 3/8 in. (14
mm) I.D.
x Larger diameter (than previously specified) lines and fittings must be used on
installations requiring long lines or numerous fittings.
x It is recommended that the exact route and length of the fuel lines be established at
the first installation of the engine to prevent problems later in connecting them to the
engine.
x Holes where the lines run through the bulkheads should be carefully rounded off or
protected with rubber grommets. This prevents damage to the lines from abrasion.
x Fuel line(s) should be installed free of stress and firmly secured to prevent vibration
and/or chafing.
x Sharp bends in fuel lines should be avoided.
x 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.
x An anti-siphon device (valve) is required. It is critical to choose one with the least
restriction. An electric solenoid anti-siphon device is one of the least restrictive and is
allowed by the Coast Guard.
x The maximum measured vacuum at the engine’s fuel inlet must not exceed 2 in.
Hg(6.9 kPa) at idle rpm and full throttle rpm.