1968–1969 Corvette C3 Fuel Tank 20 Gal No Return Tubes 3931820 - OEM Number(s) (3931820,3967741)
Reproduction of GM #3931820 / #3967741
End your rusted, leaking fuel tank problems now! Our 1968–1969 Corvette Reproduction Fuel Tank has the correct indentations for mounting and includes the filler neck gasket, O-ring, and lock ring necessary for installation. Designed for early production 1969 and 1968 models, this tank supports high-performance engines like the 427/400hp and L71 435hp while maintaining GM-spec accuracy.
Because Details Matter
• 20 Gallon Capacity
• Non-Vented Tank Design
• No Return Tubes or Brackets
• Includes filler neck gasket, cam lock ring, and O-ring
• Small side indentations
• Fits 1968 All / 1969 350/350 and 427/400, 427/435
• Fits 1969 up to July 1969 production
• Reproduction of GM #3931820 and #3967741
• Hollander Interchange #610
Under the Straw Hat – Restorer’s Insight
While most associate return line tanks with later C3s, this early tank used in high-performance L68 and L71 builds features a clean non-return configuration and small-side indent pattern. Matching this detail can make or break an NCRS-judged restoration. Always verify your car’s original tank configuration before ordering.
Important Tech Note
All fuel tanks are manufactured with a sprayed-on interior rust inhibitor. This lining must be removed before installation to prevent dissolved preservative from clogging your fuel system.
How to Prep Your Fuel Tank for Installation
• Close off tank openings with rags and duct tape
• Add cleaner (Carb Cleaner, Acetone, or MEK)
• Caution: No smoking or open flames nearby
• Add small metal parts (nuts, bolts, washers), shake and rotate
• Repeat until cleaner drains clear; dispose responsibly
• Remove rags, tape, and metal parts—allow to dry completely
Whether you're restoring a tri-power big block or just ensuring leak-free performance, this tank delivers authentic fitment and the kind of precision detailing that turns heads and wins shows.
Also known under these part numbers: (For reference only)
- 363002
- 3931820
- 3967741
- 609781
- 686420018155
- GM33B