Additional Technical Fuel
Requirements
• The fuel cetane number should be equal
to 48 or higher.
• The sulfur content must not exceed 0.3%
by volume. Less than 0.05% is preferred.
• Water and sediment in the fuel should not
exceed 0.05% by volume.
• Ash content not to exceed 0.01% by mass.
• Carbon residue content not to exceed
0.35% by volume. Less than 0.1% is
preferred.
• Total aromatics content should not exceed
35% by volume. Less than 30% is
preferred.
• PAH (polycyclic aromatic hydrocarbons)
content should be below 10% by volume.
• NEVER mix kerosene, used engine oil or
residual fuels with the diesel fuel.
• NEVER use Biocide or mix winter and
summer fuels.
• Keep the fuel tank and fuel-handling
equipment clean at all times.
• Poor-quality fuel can reduce engine
performance and / or cause engine
damage.
• Fuel additives are not recommended.
Some fuel additives may cause poor
engine performance. See your authorized
Yanmar marine dealer or distributor for
more information.
• Lubricity HFRR < 400 micrometer ISO
12156 (HFRR: High Frequency
Reciprocating Rig).
Diesel Fuel Lines
0003638A
(1)
(3)
(5)
(7)
(4)
(6)
(2)
Figure 1
1 – To Fuel Feed Pump
2 – Less Than 500 mm (19.68 in.)
3 – Fuel Return Line
4 – Fuel Tank
5 – Fuel Tank Drain Cock
6 – 20 - 30 mm (0.75 - 1.125 in.)
7 – Fuel Shutoff Valve
Shown is a typical installation of a boat fuel
system. Fuel supply (Figure 1, (2)) and
return (Figure 1, (4)) lines connect to
fittings at the engine.
Total suction resistance shall be less than
0.1 bar (40 in.Aq). High resistance may
cause poor performance and reduce fuel
system life.
Note: Yanmar supplies a water separating
pre-filter for mounting by the installer. The
engine is also equipped with an on-engine
fine filter.
BEFORE YOU OPERATE
BY Series Operation Manual
23
© 2008 Yanmar Marine International
