In the 21st century, there’s a marine fuel filter out there with your name on it. When used as either a replacement part or an aftermarket install, these filters are an important part of a fuel system. So, which type is best for your boat? That depends on whether you have stern-drives or outboards and how much space is available for installation. For gasoline engines, there are filters with or without bowls, including both clear plastic and aluminum bowls. And don’t forget about disposable in-line filters. Here’s a quick review of each, with pros and cons and suggested uses.