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6. The return pipes – direct surplus fuel to the tank and evacuate any air locks.
NOTE – whenever the fuel system has been serviced, bleeding it by operating the
primer pump some 30 – 50 strokes is worthwhile. Any air locks trapped in the
system will otherwise cause trouble or make starting impossible.
NOTE – handling the fuel system requires total cleanliness. The injection pump and
injector tolerances are very fine and any fragment of dirst or the tiniest amount of water
could ruin the injector operation.
Air filter replacement – is easily carried out by undoing the filter housing clasps. The filter
paper element is discarded and cannot be used again. Clean out the filter housing and
install a new element. (Type BMW 13 321 329 269)
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