Partner K 650/700 Active Workshop Manual page 29

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Fuel system
In the event of leakage - dismantle the
needle valve.
Check the needle valve and lever for
wear.
Replace damaged parts with new ones.
Remove the pump diaphragm.
Check the diaphragm for damage.
Remove the fuel strainer.
In the event of leakage dismantle the
needle valve.
Release the screw and lift off the lever,
shaft, needle valve and spring.
Check the needle valve for damage at the
point and the groove for the lever.
Check the lever for wear in the grooves
for the needle valve and the diaphragm.
Replace damaged parts with new ones.
If the new needle valve also leaks the
fault may be that the seat for the valve is
damaged.
Remove the screws which hold the cover
over the pump diaphragm.
Lift off the cover, gasket and diaphragm.
Check the diaphragm for damage on the
valve tongues. Hold it up to a lamp to
inspect for holes in the material.
Carefully remove the fuel strainer, e.g. by
using a needle.