Operation and maintenance manual

Section 200-0040
Fuel System - Fuel System
SM 1398 Rev 1 2-00
4
Every 10 Hours/Daily:
Make a visual check for fuel leaks at all engine mounted
fuel lines and connections, fuel cooler, and at the fuel tank
suction and return lines. Examine lines for leaks and
check all fittings, clamps and ties carefully.
Make sure that fuel lines are not resting on or touching
rotating components, heated surfaces including
exhaust manifolds or sharp edges. If fittings have
loosened or cracked, or if lines have ruptured or worn
through, take corrective action immediately.
Every 250 Hours:
Replace the primary and secondary fuel filters as
follows:
Note: There is a fuel system shut off cock on the
discharge side of the secondary fuel filter. Closing this
valve will prevent loss of fuel prime at time of filter
replacement.
1. Close shut off valve at secondary fuel filter and,
using a strap type filter wrench, remove and discard
both the primary and secondary fuel filters from the
engine.
2. Fill the replacement filters and coat the gaskets
slightly with clean fuel oil as specified in Section
300-0020, LUBRICATION SYSTEM.
3. Start new primary fuel filter on the filter adaptor and
tighten it by hand until the gasket contacts the adaptor
fully with no side movement of the filter evident.
Tighten an additional 1/2 of a turn.
Note: Mechanical tightening of fuel filters is not
recommended, and may result in seal and/or cartridge
damage. Tighten fuel filters by hand only.
4. Repeat step 3 to install a new secondary fuel filter.
5. Start the engine and check for leaks. If any leaks
are noted, have them corrected.
Every 250 Hours:
Open the drain at the bottom of the fuel tank to drain
off any water and/or sediment. Check the seal in fuel
tank filler neck cap and clean filler neck screen and
cap. Check the condition of all fuel lines and replace if
required. Clean and inspect fins on fuel cooler.
Every 1 000 Hours:
Remove filler cap (24) from filler neck. With the handle
in the up and rotated position, remove the two screws
securing the filter assembly to the cap. Discard 'O'-
rings. Clean top of filler cap (24) and valve cavity.
Install new filter assembly to filler cap (24) using new
screws and 'O'-rings (supplied with new filter). Tighten
screws to 10 - 13 in lbs.
Diesel Fuel Oil
The sulphur content of diesel fuel oil should be as low
as possible to avoid premature wear of piston rings and
liner, excessive deposit formation, and minimise
sulphur dioxide exhausted into the atmosphere. Limited
amounts can be tolerated, but the amount of sulphur in
the fuel and engine operating conditions can influence
corrosion and deposit formation
tendencies. The use of diesel fuel oil with a MAXIMUM
sulphur content of 0.5% is recommended for use. Refer
to Section 300-0020, LUBRICATION SYSTEM.
TROUBLESHOOTING
Locating Air Leaks in Fuel Lines
Air drawn into the fuel system may result in uneven
running of the engine, black or white smoking and
stalling when idling, or a loss of power. Poor operation
is particularly noticeable at lower engine speeds. If air
is found in the fuel, the source will normally be between
the fuel tank and the fuel pump.
Check for loose, faulty or improper fuel line connectors.
Presence of an air leak may be detected
by following the procedures under 'Checking Fuel Flow'.
Checking Fuel Flow
1. Disconnect the fuel return line from the fitting at the
fuel tank and hold the open end in a suitable container.
2. Start and run the engine at maximum rev/min and
measure the fuel flow. Nominal fuel return spill with the
standard 2.03 mm (0.08 in) restricted fitting is
4.1 litres/min (65 US gal/min).
3. Immerse the end of the fuel return line in the fuel. Air
bubbles rising to the surface of the fuel will indicate air
being drawn into the fuel system on the suction side of
the pump. If air is present, tighten all fuel lines
connections between the fuel tank and fuel pump.