Chris-Craft Lancer 20 Owner's Manual page 62

Safety and Operations
After fueling:
1. Replace the fuel deck plate. Make sure the cap is tight to prevent water from leaking into the fuel tank.
2. Wipe up any spilled fuel on the deck and surrounding area. Dispose of rags properly.
3. If appropriate, open any hatches, ports, doors, and windows to ventilate the cabin.
4. Investigate for leaks and drips. Make any corrections necessary.
The fuel deck plate cap is fitted with an O-ring that over time may
become worn and/or damaged. Inspect the cap on a regular basis
and replace as necessary.
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