Mercury 80 Owner's Manual page 49

Fuel vapor vent system is under pressure. Cover valve assembly with a rag or towel to prevent fuel or fuel
vapor spray. Relieve pressure slowly.
3. Place a rag or towel around the valve, and release the fuel pressure by pushing the core of the valve end
in.
4. Push in on the fuel hose release tabs and disconnect the fuel hoses from the fuel filter.
a - Fuel hose release tab
Installation
1. Install the new fuel filter so the arrow points towards the engine.
2. Connect the fuel hoses to the fuel filter securely with the locking hose connections.
3. If removed, place the fuel hose into the fuel hose retainer.
MAINTENANCE
CAUTION
!
a
b
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a
20815
b - Low pressure fuel filter