MacDon M105 Operator's Manual page 258

System Priming
Controlled venting of air is provided at the injection pump through the fuel drain manifold. Small amounts of air
introduced by changing filters or injection pump supply line will be vented automatically, if the fuel filters are
changed in accordance with instructions.
IMPORTANT:
Bleeding the fuel system is NOT recommended or required. Manual priming will be required if:
• Fuel filter is replaced.
• Injection pump is replaced.
• High-pressure fuel lines are replaced.
• Engine is run until fuel tank is empty.
Priming Fuel System
To prime the fuel system, follow these steps:
DANGER
Stop engine and remove key from ignition before leaving operator's seat for any reason. A child or even a
pet could engage an idling machine.
WARNING
The fuel pump high-pressure fuel lines and fuel rail contain extremely high pressure fuel. Never loosen
any fittings. Personal injury and property damage can result.
1. Stop the engine and remove the key.
2. Open the hood to lowest position.
Opening Hood (Lower Position), page
3. Turn the priming knob (A) counterclockwise to unlock
the plunger on the primary filter head.
4. Pump approximately 120 times to pressurize the
fuel system.
5. Lock the plunger by turning knob (A) clockwise
until snug.
6. Try starting engine.
repeat priming.
7. Close hood. Refer to
Position), page 203.
169890
MAINTENANCE AND SERVICING
Refer to
202.
If engine does NOT start,
5.4.2 Closing Hood (Lower
5.4.1
Figure 5.92: Fuel System
244
Revision A