Welcome to Allen-Jac Inc.

Certified Aluminum Welding & Fabrication

Backed by more than 40 years of experience, the highly skilled team at Allen-Jac offers premium quality fabrication and repair for diesel fuel tanks.

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Custom Fabrication & Modification

Combo Tanks Built to Spec

Our team can split existing tanks to accomodate both diesel fuel and hydraulic fluid. We can modify tanks from many leading providers, including Peterbilt, Kenworth, Frieghtliner, International, and more.

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The Fuel Tank Experts You Can Trust

Fabricated to the Highest Possible Standards

Every fuel tank we create at Allen-Jac Inc. is fully pressure tested and meets FMCSA standards. Best of all, all of our work includes an impressive warranty to keep your equipment on the road where it belongs.

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About Us
Our Services
Our Tanks
Careers

What We Do Best

For over 40 years, Allen-Jac Inc. has been fabricating and repairing aluminum diesel fuel tanks for clients across the United States. Our unmatched welding and fabricating skills ensure top-of-the-line quality, backed by our impressive product warranties. Every tank we produce at Allen-Jac is pressure tested and meets FMCSA standards.

  • Fuel Tank Fabrication
  • Combo Tanks Built to Spec
  • Hybrid Diesel Fuel / Hydraulic Fluid Tanks
  • Damaged Tank Repair
  • Aluminum Welding
  • Aftermarket Manufacturing
  • Delivery or Onsite Pickup
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Serving Customers Nationwide

We're located in Sandpoint, ID but Allen-Jac serves semi trucking operations and anyone in need of diesel fuel tanks across the United States. Learn more about our customers below.

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Our Customers


Truck Fleets

Allen-Jac is ready to help you keep your fleet on the road and operating at peak performance. Our team offers top-of-the-line tank fabrication and repair for over the road truckers, logging trucks, farm trucks, waste management trucks, and more.

Owners & Operators

In addition to aluminum welding and repair for damaged fuel tanks, Allen-Jac can also split existing tanks into combination hydraulic fluid and diesel fuel tanks - or fabricate something completely new to your specs.

Repair Shops

Not all semi truck repair shops and body shops offer aluminum repair welding. At Allen-Jac, we can help you complete your biggest jobs with premium quality repair welding for diesel fuel or hydraulic tanks.

Marinas & Fish Hatcheries

Our team takes on a wide variety of specialty orders. In addition to custom tank fabrication for fish hatcheries, Allen-Jac also offers repair for aluminum pontoons and patio boats.