Yanmar 3GM30 no Diesel overflow returns

I understand that all (most) diesel engines return overflow diesel to the tank. It does not happen on my machine. The machine runs fine especially after I have changed the nozzles. Should I do something or is it OK?

 

Many small diesels only return trace amounts. Some divert what would be return fuel back to the injector pump intake and have no return line. Engines that return large amounts of fuel usually have a gear lift pump. You probably have a engine driven diaphragm pump that only provides slightly more fuel than the engine burns.

 

Thanks !