Freightliner Cabover Fuel Tanks

Frequently Asked Questions About Freightliner FLT Cabover Fuel Tanks

What size fuel tanks are available for my Freightliner FLT cabover, and how do I determine which fits my truck?

Freightliner FLT cabover fuel tanks typically come in 50, 75, 100, and 120-gallon capacities. To determine the correct size for your truck, check your door jamb sticker for the original tank specifications or measure your existing tank's dimensions (length x width x height). Most FLT models from 1980-1991 can accommodate tanks ranging from 19" to 26" in diameter. Always verify your frame rail spacing and available mounting area before ordering.

Are these fuel tanks made of aluminum or steel, and which material is better for my application?

Both aluminum and steel options are available. Aluminum tanks are lighter (reducing overall vehicle weight by 50-100 lbs), resist corrosion better, and are ideal for drivers concerned about fuel economy. Steel tanks are more affordable upfront, extremely durable against impacts, and easier to repair if damaged. For coastal regions or areas using road salt, aluminum is recommended. For heavy-duty applications where impact resistance is crucial, steel performs better.

Will these fuel tanks fit both the FLT and FLC model cabovers?

While many fuel tanks are interchangeable between FLT and FLC models, there are important differences. FLT models (1979-1989) typically use round tanks with specific strap mounting configurations. FLC models (1986-1991) often require D-shaped tanks or have different step box clearances. Always specify your exact model year and whether you have an FLT or FLC when ordering. Some tanks are universal fit, but mounting brackets may differ.

What mounting hardware is included, and what additional parts might I need for installation?

Most replacement fuel tanks include basic mounting straps and rubber isolators. However, you'll typically need to purchase separately: fuel tank steps (if applicable), sending units, fuel caps, crossover hoses for dual tank setups, and mounting brackets specific to your frame width. Installation usually requires 2-4 hours and basic hand tools. Professional installation is recommended if you're replacing sending units or modifying fuel lines.

Do these tanks come with a polished finish, and how do I maintain the appearance?

Aluminum tanks are available in mill finish, brushed, or mirror-polished options. Polished tanks require regular maintenance with aluminum polish every 2-3 months to prevent oxidation. Steel tanks come primed, painted, or powder-coated. For the iconic chrome look, many drivers opt for polished aluminum or add chrome tank covers. Remember that polished finishes typically add $75-150 to the base price but significantly enhance your truck's appearance.