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A.8.3.4.1.1 Commercial distillate fuel oils
used in modern diesel engines are subject to
various detrimental effects from storage. The
origin of the crude oil, refinement processing
techniques, time of year, and geographical
consumption location all influence the
determination of fuel blend formulas.
Naturally occurring gums, waxes, soluble
metallic soaps, water, dirt, blends and
temperature all contribute to the degradation
of the fuel as it is handled and stored. These
effects begin at the time of fuel refinement
and continue until consumption. Proper
maintenance of stored distillate fuel is
critical for engine operation, efficiency, and
longevity.
Storage tanks should be kept water-free.
Water contributes to steel tank corrosion and
the development of microbiological growth
where fuel and water interface. This and the
metals of the system provide elements that
react with fuel to form certain gels or
organic acids, resulting in clogging of filters
and system corrosion. Scheduled fuel
maintenance helps to reduce fuel
degradation. Fuel maintenance filtration can
remove contaminants and water and
maintain fuel conditions to provide reliability
and efficiency for standby fire pump engines.
Fuel maintenance and testing should begin
the day of installation and first fill.
A.8.3.4.2 Where environmental or fuel
quality conditions result in degradation of
the fuel while stored in the supply tank, from
items such as water, micro-organisms and
particulates, or destabilization, active fuel
maintenance systems permanently installed
on the fuel storage tanks have proven to be
successful at maintaining fuel quality. An
active fuel maintenance system will maintain
the fuel quality in the tank, therefore
preventing the fuel from going through
possible cycles of degradation, risking
engine reliability, and then requiring
reconditioning.
3.1.2 Bleeding the Fuel System
CAUTION: Escaping fluid under pressure can
penetrate the skin causing series injury. Relieve
pressure before disconnecting fuel or other lines.
Tighten all connections before applying pressure.
Keep hands and body away from pinholes and
nozzles, which eject fluids under high pressure.
Use a piece of cardboard or paper to search for
leaks. Do not use your hand.
If ANY fluid is injected into the skin, it must be
surgically removed within a few hours by a doctor
familiar with this type injury or gangrene may
result. Ref Figure #11
Figure #11
Whenever the fuel system has been opened up for
service (lines disconnected or filters removed), it will
be necessary to bleed air from the system.
DP6H, DQ6H, DR8H, DS0H, DT2H Engine Series:
1) Loosen the air bleed valve (A) by hand on fuel
filter head. Ref. Figure #12A and #12B.
2) Operate supply pump primer lever (B) until
fuel flow is free from air bubbles. On the DP6H,
and DQ6H it will be necessary to rotate pump
handle to release it and then to lock in place after
fuel system is bled. Ref. Figure #13A and #13B.
3) Tighten bleeding valve securely; continue
operating hand primer until pump action is not
felt.
4) Start engine and check for leaks.
Figure #12A – DP6H, DQ6H, DR8H, & DS0H
models
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