Yanmar 3YM30 Sevice Manual page 97

(13)Removing the fuel injection pipe
1) Remove the fuel injection pipe retainer.
2) Loosen the cap nuts on both ends of the fuel
injection pipe and remove the fuel injection pipe.
Note:
When loosening the cap nut, loosen the nut with
holding the return pipe by hand so that the fuel return
pipe may not break.
3) Remove the fuel return pipe (fuel nozzle-fuel
pump)
(14)Removing the fresh water pump
Remove the fresh water pump and gasket.
Fuel injection pipe Fuel injection pipe Fuel injection pipe
Cap nut Cap nut Cap nut
Fuel return pipe Fuel return pipe Fuel return pipe
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4. Disassembly and reassembly
Fuel injection pipe retainer
Fuel injection pipe
Fuel injection pump
Fuel return pipe
Fuel injection
nozzle
Cylinder head
Gasket
O-ring
No. 3
No. 2
No. 1
Fresh water pump