Article C6.1
Fuel Tanks
Technical Regulations
Article C6.1
Fuel Tanks
Chapter: C6
In Simple Terms
F1 cars must use a single rubber fuel tank that meets strict safety standards set by the FIA. Teams can choose to add foam inside the tank for extra safety, but it's not required.
- Fuel tank must be a single rubber bladder (not multiple tanks or different materials)
- Must meet or exceed FIA Standard FT5-1999 safety specifications
- Foam padding inside the tank is optional, not mandatory
- Designed to prevent fuel leaks and contain fuel during crashes
Official FIA Text
The fuel tank must be a single rubber bladder conforming to or exceeding the specifications of FIA Standard FT5−1999, the fitting of foam within the tank however is not mandatory.
fuel tankrubber bladdersafety standardfia ft5-1999foam padding
2026 Season Regulations