SHB 803 en – Edition 2.4 * 803s312.fm 3-15
Maintenance
Bleeding the fuel system
If the fuel, as it drains, comes into contact with hot engine parts or the exhaust
system, there is an increased
Fire hazard!
☞Never bleed the fuel system if the engine is hot!
Bleed the fuel system in the following cases:
• After removing and fitting the fuel filter, prefilter or the fuel lines back on again
• After running the fuel tank empty
• After running the engine again, after it has been out of operation for a longer period of
time
Bleed the fuel system as follows:
• Fill the fuel tank
• Turn the starting key to the first position
• Wait about 5 minutes while the feed pump bleeds the fuel system automatically
• Start the engine
• Check for leaks after starting the engine
• Let the fuel system run by performing a test run of 5 minutes at idling speed
If the engine runs smoothly for a while and then stops, or if it does not run smoothly:
• Stop the engine
• Raise the lock lever
• Remove the starting key
• Bleed the fuel system again as described above
• Have this checked by authorized personnel if necessary
Fuel prefilter with water separator
Check the fuel prefilter as follows:
☞Remove the right-hand chassis cover in order to be able to see the water separator.
☞If the red indicator ring rises to position C
☞Unscrew thread A
➥Empty the receptacle
➥Fit the receptacle back on again
☞Screw thread A back on again
☞Bleed the fuel system – see chapter Bleeding the fuel system on page 3-15
Interrupt fuel supply as follows:
☞Turn ball-type cock B to the OFF mark
➥Fuel supply is interrupted
☞Turn ball-type cock B to the ON mark
➥Fuel supply is open again
On
Off
A
B
C
Fig. 3: Fuel prefilter
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