SECTION 03: FUEL SYSTEM
6
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Section 03 revised May 2018)
2. Clean around sealing area on fuel filter and
housing.
3. Unscrew and remove the secondary fuel
filter from the fuel filter housing.
4. Apply a thin coating of clean engine oil to
the gasket of the secondary fuel filter. Screw
the fuel filter into position. Tighten the filter
¾ to 1 turn after the gasket makes contact
with the fuel filter housing.
CAUTION
Fuel in the old filter
must absolutely not
be
poured into the new filter. This kind of
contaminated fuel can damage the unit
injectors.
5. Prime the fuel system by pumping the hand
priming pump on the fuel filter housing until
resistance is felt indicating that the system is
full of fuel.
6. Start
the
engine
and
carry
out
a
fuel-tightness check. Let the engine run for
about 5 minutes to remove air pockets from
the fuel system.
1.3 PRIMING THE FUEL SYSTEM
The fuel system will need to be bled if:
•
The vehicle has run out of fuel.
•
The engine has not been running for an
extended period of time.
•
Service work has been done on the fuel
system, (tank, fuel lines, filters, valves, etc.)
for example cleaning or replacing fuel filter
cartridges.
•
The engine is new or rebuilt.
CAUTION
When priming the system, movement of the
primer pump should be as up and down as
possible. Avoid putting any side load on the
pump or causing a binding condition. Failure
to follow these instructions could prematurely
damage the primer pump.
NOTE
When the fuel system is empty, 200 or more
pump strokes may be needed to properly
prime system. There are no bleed nipples to
be opened to prime the fuel system.
1. Stop engine;
2. Unlock the hand pump by turning the handle
counterclockwise.
3.
Prime the system by moving the primer pump
in an up and down pumping motion. Avoid
putting any side load on the pump or causing
a binding condition.
FIGURE 5: HAND PRIMING PUMP
4.
Lock the hand primer pump by retracting it
into the housing and turning it clockwise.
5. Start the engine and run it at an increased
idle speed for approximately 5 minutes to
remove any remaining air in the system.
Check the fuel system for leaks.
1.4 FUEL PUMP REMOVAL AND
INSTALLATION
The pump is located underneath the air
compressor and is accessible through the engine
compartment R.H. access door.
To remove the pump, proceed as follows:
•
Clean around the fuel pump and fuel lines.
Position a container to catch any fuel that
might drain from the pump or lines.
•
Remove the fuel pump.
