
10.4.3.1 Bleeding the fuel system
Air can enter the fuel system if the fuel tank is empty after a fuel filter change or when carrying out
work on the fuel lines.
If the engine refuses to start despite a full tank, bleed the fuel system.
Fig. 46 Bleeding the fuel system
1
Fuel prefilter with integrated water separator
2
Bleed screw
3
Manual fuel pump
1. Place a receptacle beneath the fuel pre-filter housing.
2. Open the bleed screw at the filter head.
3. Actuate the manual fuel pump until the bleed screw does no longer emit air bubbles.
4. Close the bleed screw at the filter head.
5. Remove the receptacle.
6. Open the left-hand door.
7. Turn on the «battery isolating switch».
8. Close the doors.
Start the engine as soon as the fuel system has been bled and allow to run for at least 5 mi‐
nutes in IDLE.
9. Open the right-hand access door.
10. Check the fuel prefilter for leaks.
Fuel has escaped: Re-tighten filter cartridge and all screw connections.
11. Close the door.
10.4.3.2 Fuel pre-filter maintenance
Emptying the fuel water separator:
The fuel pre-filter is equipped with an integrated water separator. Contaminants in the water are
trapped in the water receptacle of the filter cartridge.
The water separator is connected by a sensor to the controller. If the water in the separator rea‐
ches a set level, the controller displays a warning.
The display indicates water in the fuel filter by showing
Fuel filter water level.
The water separator must be emptied immediately when this warning is displayed.
10 Maintenance
10.4 Drive engine maintenance
No.: 901783 08 USE
Operator Manual Portable Rotary Screw Compressor
MOBILAIR M82 SIGMA CONTROL SMART
129