Section 03: FUEL SYSTEM
PA1593
4
Other
The fuel filter housing eliminates the need to
drain the fuel when replacing the filter. The valve
pegs (17) and (21) close when the fuel filter is
removed. It is not necessary to bleed the fuel
system after replacing the filter, since this is
performed automatically when the engine is
started and runs for more than 2 minutes.
The plugged outlet (18) is fitted on the fuel filter
housing. This outlet is used when measuring
supply pressure after the fuel filter with an
external pressure gauge. The pressure sensor
(19) on the fuel filter housing monitors the
supply pressure after the fuel filter. A fault code
is displayed on the instrument cluster if the fuel
supply pressure is less than the specified value.
Hand Priming Pump
The hand priming pump (13) is located on the
fuel filter housing and is used to pump fuel
(when engine is not running) after the fuel
system has been drained for repair, etc. The
non-return valve (22) for the hand priming pump
is also located in the fuel filter housing.
1.2 FUEL VALVES
The manual shut-off valve on engine fuel-supply
line is located on the R.H. side of engine
compartment. A manual shut-off valve is located
at the inlet side of the primary fuel filter.
FIGURE 2: MANUAL SHUT-OFF VALVE (VOLVO D13
ENGINE)
03088
Shut-off valve is designed to prevent loss of fuel
prime. No manual valve is required on preheater
fuel-supply line, since the positive-displacement
fuel pump (located close to the fuel tank) prevents
fuel flow when not activated.
FUEL LINE FITTINGS – VOLVO D13 ENGINE
A 13 ± 2 ft-lb (18 ± 3 Nm)
B 20.5 ± 3 ft-lb (28 ± 4 Nm)
C 22 ± 3 ft-lb (30 ± 4 Nm)
D 26 ± 4 ft-lb (35 ± 5 Nm)
E 29.5 ± 4 ft-lb (40 ± 5 Nm)
F 35 ± 4 ft-lb (48 ± 5 Nm)
FIGURE 3: FUEL LINE COMPRESSION FITTING
CAUTION
Always replace the fuel line compression
sealing washers when troubleshooting for fuel
aeration or performing any service procedure
that requires the removal of engine fuel lines.
1.3 FUEL FILTERS
A primary fuel filter is installed on the engine.
This filter consists of a filter cartridge, a water
separation bowl with a drain valve. It is used to
prevent water from entering the fuel system.
MAINTENANCE
The primary and secondary fuel filters are of a
spin-on type and must be replaced at every
engine oil change.
The primary fuel filter should be drained
periodically or when the telltale light on the
dashboard illuminates if equipped with this
system. To drain water, loosen the drain valve
below the separator. Place an appropriate
container under the filter. Close the drain valve
when finished.
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