FNM HPE Series Owner's Manual page 77

2. Clean or wash the filter with fresh water to remove the clogging elements.
3. Re-close the filter and check for any leaks.
Always verify for the good seal of the filter cap to avoid leakage after reassembly.
3.3.4 Fluids leakage check
Ordinary maintenance: made by the boat user and the workshop staff.
Periodically check that the engine does not lose any kind of fluid before, during and after its operation.
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FNM HPE Series
Figure 32 - Sea water filter cleaning under running water
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