FNM HPE Series Owner's Manual page 78

Check if there are drips from the engine on the bottom of the engine compartment, if there are leaks
from tanks and hoses and that all the ducts that depart from the engine (sea water, fuel, steering oil)
are free of condensation.
When there is excessive reduction of any level while using the engine, immediately shut down
the engine and find the source of the leak.
3.3.5 Fuel filter draining and inspection
Ordinary maintenance: made by the boat user and the workshop staff.
The fuel filter of your engine may be on the engine itself, or be placed on the wall in the engine
compartment (HPE/P 300).
To drain the fuel filter:
1. Remove the water in fuel presence sensor plug from under the filter.
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FNM HPE Series