The generator has an integrated oil tank, which is installed on the generator, usually on the base. There is also a daily fuel tank, which typically provides 8 hours of use. This fuel tank is usually installed high up to facilitate the flow of oil to the generator. If you put it underground, you still have to solve the pump problem, which is complicated, but it's not as good as being elevated.
Generator Diesel Tank
Introduction The generator diesel fuel tank has its own fuel tank, which is installed on the generator, usually on the base. There is also a daily fuel tank, which can generally provide 8 hours of use.