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Beneath the seat, protected by the steel frame, will be a race-quality fuel cell holding about five gallons. Here's how Wikipedia defines a racing fuel cell (not to be confused with the fuel cells which generate electricity):

"A racing fuel cell is a fuel container that differs from an ordinary fuel tank in the following ways: It has a flexible inner liner to minimize the potential for punctures in the event of a collision or other mishap resulting in serious damage to the vehicle. It is insulated with a mesh-like structure inside the tank to minimize sloshing of fuel during competition that may otherwise cause inadequate fuel (fuel starvation) delivery to the motor under competition conditions."

Although it's pretty unlikely anything would puncture an ordinary tank inside the frame, adding extra safety can't hurt, especially when you're sitting atop a potential fireball. On the side with the chain I'm adding a steel panel between it and and the frame to protect the tank if the chain comes apart at speed.

Below are example fuel cells from different manufacturers, but mine would have to be custom size at an additional cost.