This is a common point of confusion! A fuel tank simply *stores* fuel – gasoline, diesel, ethanol, etc. It’s a passive container designed to hold liquid.

A fuel cell, particularly the type used in motorsports, is a much more sophisticated safety device. While it also stores fuel, it's constructed from multiple layers of reinforced materials (like ballistic nylon) and contains foam baffling. This design prevents fuel sloshing, minimizes the risk of fire in an accident, and maintains consistent fuel delivery to the engine.

Think of a fuel tank as a bucket, and a fuel cell as a heavily armored bladder. Fuel cells are more expensive but offer significantly enhanced safety for high-performance applications like racing or off-roading where crashes are more likely.

The two main types of fuel tanks are steel and plastic. Steel fuel tanks have been the standard for decades, offering excellent durability and resistance to punctures. They’re relatively inexpensive but heavier than their plastic counterparts.

Plastic fuel tanks, typically made from high-density polyethylene (HDPE), are becoming increasingly popular due to their lighter weight, corrosion resistance, and ease of molding into complex shapes. They're also less prone to denting, which can affect the internal baffles and fuel delivery.

While steel is tougher against impact, plastic tanks often offer better long-term reliability in harsh environments. Modern plastic tanks are surprisingly strong and meet or exceed safety standards.

Whether a fuel cell is legal for street use depends heavily on local regulations and the specific design of the cell. Most racing-style bladder fuel cells aren't DOT (Department of Transportation) approved and are therefore illegal for public roads.

These cells often lack features like rollover valves and venting systems required for road legality, prioritizing weight savings and performance over street compliance. However, some manufacturers produce DOT-approved fuel tanks that incorporate similar safety features to a fuel cell but meet all legal requirements.

Always check your local laws before installing any aftermarket fuel tank or cell. Using an illegal component could void your insurance and lead to fines. If you're unsure, err on the side of caution and stick with DOT-approved tanks.

There are several main types of fuel cells, each with its own characteristics and applications. The four most common are Proton Exchange Membrane (PEM) fuel cells, Solid Oxide Fuel Cells (SOFC), Alkaline Fuel Cells (AFC), and Phosphoric Acid Fuel Cells (PAFC).

PEM fuel cells are popular for vehicles due to their low operating temperature and quick start-up time. SOFCs operate at very high temperatures, making them efficient for stationary power generation. AFCs were used in early space missions but require pure hydrogen and oxygen. Finally, PAFCs are relatively mature technology used in combined heat and power systems.

For performance vehicles, you’ll mainly encounter bladder-style fuel cells (a type of PEM) designed for safety and consistent fuel delivery under extreme conditions. These aren't the same as those powering electric cars—they focus on *storing* fuel, not generating electricity directly.