Related Clues:

• Hydrogen, e.g.
• Hard as a rock
• Neon or helium
• Fun time, slangily
• Tankful
• Word with tank or range
• Terrific time
• Ford fuel
• 3-D figure
• Unbroken, as a line
• Yakety-yak
• Pump purchase
• 82-Down, e.g.
• Tank fill
• Fuel