The three types of fuel tanks are:
1. Gravity-feed tanks
2. Pressure-feed tanks
3. Siphon-feed tanks
Gravity-feed tanks are the most common type of fuel tank. They are simple and easy to construct, and they work well with most types of fuel.
Pressure-feed tanks are less common, but they offer some advantages over gravity-feed tanks. They can be pressurized, which means that they can deliver fuel to the engine more rapidly.
Siphon-feed tanks are the least common type of fuel tank. They are typically used only in racing applications, where the extra weight of the fuel is not a concern.