I would do everything possible before removing the cap. That is the most difficult thing you could possibly do on a V20. That is a rebuild project.
You have a cuddy model right?
Two simple things you can do... two things you should have done the day after you bought it...
Remove the gunnel boxes/covers and look in there with your eyes, arms, and a camera.
Remove the fuel tank deck lid and look in there. The whole thing not just the round ports.
Possible under the passenger back-to-back seats you can get access or make access to see something
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