10.3.3.1 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. 42 Bleeding the fuel system
1 Bleed screw
2 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. Continue to actuate the manual pump until high resistance is felt and pumping is very slow.
6. Keep pumping until the return line is filled.
7. Reconnect the batteries.
8. Close the access door.
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 pre-filter for leaks.
If a leak is found, tighten the filter element and fittings.
11. Close the access door.
10.3.3.2 Fuel pre-filter maintenance
Emptying the water trap
The fuel pre-filter is equipped with a water trap. Contaminants in the water are trapped in the water
receptacle of the filter cartridge.
The water trap is connected to an indicator lamp on the instrument panel. If the water in the recep‐
tacle rises to a set level, the indicator lamp
fuel level monitoring
on the instrument panel lights. It
indicates that the water trap must be emptied immediately.
10 Maintenance
10.3 Engine maintenance
94
Service manual Portable compressor
M122 No.: 9_6974 20 E
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