Product Description
Jeep shrank the J-Series filler neck to 1" for these two model years, still mounted on the side of the tank — a different setup from the earlier Gladiator/J-Series tank (SKU 0011) and the later front-fill version (SKU 0013). This tank matches the original 1978-1979 side-fill spec exactly and ships with a new lock ring and gasket.
A tank this old has usually already sprung one leak or been patched at least once, and every patch job is just delaying the next one. Cross-linked polyethylene construction sidesteps that cycle entirely — the material doesn't corrode, so getting the fitment and installation details right matters far more here than any patch repair ever could.
Technical Specifications
- Capacity: 18 Gallons
- Material: High-Density Cross-Linked Polyethylene
- Dimensions: 25.25" x 17.25" x 13.75"
- Installation Type: Lock Ring
- 1" filler neck, 0.75" vent neck (side-mounted)
- Includes new lock ring and gasket
Fitment
- Jeep J-Series (Side Fill) | 1978-1979
✓ Appearance Note: Because each tank is custom molded, you may occasionally notice minor cosmetic surface bubbles left over from the molding process. This is purely cosmetic, has no effect on performance or durability, and doesn't occur on every unit — every tank is individually pressure-tested before it ships to confirm a leak-free seal.
⚠ Order Notice: MTS builds each fuel tank to order rather than pulling from mass-produced stock. Please allow a 7–10 business day lead time for manufacturing and individual pressure testing before your tank ships.
Product Videos
Custom Field
Make JEEP
Model PICKUP 18-GAL "SIDE FILL"
mpn 0012
Fitment Jeep J-Series (Side Fill) | 1978-1979
