That's the setup I have. One feed from the tank to the Racor primary filter and then splits to feed the Yanmar 3GM30F and the 5 KW Northern Lights generator. Boat is a Hunter 356, 2003 we bought new. Generator was added at commissioning, but I think this is the standard setup.
Likewise, my Detroit primary filter feeds the Detroit and the Onan.
Beware though, if you have a leaky whatsit on the gen it can affect the engine, and vice versa, you have to look both places for solving. A valve is not a bad idea.
It will work with just a TEE if all lift pumps are working and everything is air tight. But each path should have its own ball valve close to the filter outlet. That way in case one engine has a problem it's possible to stop air getting into the other by closing valve to faulty engine.
Boat: We have a problem... A serious addiction issue.
Re: Fuel Distribution Question
It's not just the filter size, you also need to size the delivery hose to the Y fitting to handle the loads from both engines running at once, the same on the return lines. Otherwise you can have fuel starvation issues with both engines.
- If animals weren't meant to be eaten then they wouldn't be made of food.