Freightliner Cascadia 113/125 Fuel Tanks

Frequently Asked Questions About Freightliner Cascadia 113/125 Fuel Tanks

What size fuel tanks are available for my Cascadia 113 or 125, and which configuration should I choose?

The most common fuel tank sizes for Cascadia 113/125 models are 100, 120, and 150-gallon options. Single tank configurations typically mount on the driver's side, while dual tank setups provide balanced weight distribution and extended range. For regional hauling, a single 120-gallon tank often suffices, but long-haul drivers typically prefer dual 120-gallon or 150-gallon setups for maximum range. Consider your typical routes, payload requirements, and fuel stop availability when selecting your configuration.

Are these fuel tanks compatible with all Cascadia 113 and 125 model years?

While most aftermarket fuel tanks fit Cascadia models from 2008-2024, there are important differences between pre-2018 and 2018+ models due to frame rail changes and emissions equipment placement. The 113 and 125 models share the same frame dimensions for fuel tank mounting, but always verify your specific truck's configuration, including wheelbase, exhaust system routing, and DEF tank placement. Some 2018+ models require different mounting brackets or strap configurations compared to earlier years.

What material options are available, and how do they compare for durability?

Fuel tanks come in two primary materials: aluminum and steel. Aluminum tanks are lighter (saving 100-150 pounds per tank), resist corrosion better, and are ideal for weight-sensitive applications. However, they cost 20-30% more than steel options. Steel tanks are more affordable and highly durable but require proper maintenance to prevent rust, especially in regions using road salt. Both materials meet DOT standards, but aluminum tanks typically last 15-20 years while steel tanks average 10-15 years with proper care.

What's involved in the installation process, and can I do it myself?

Installation typically takes 3-4 hours per tank for experienced technicians. The process requires draining existing fuel, removing old tanks, transferring or replacing mounting straps and brackets, connecting fuel lines and sender units, and ensuring proper grounding. Critical tools include a transmission jack or tank jack, torque wrench, and fuel transfer pump. While DIY installation is possible, most customers opt for professional installation due to safety concerns and the need to properly calibrate fuel sending units. Budget $300-500 for professional installation per tank.

Do these tanks come with all necessary mounting hardware and fuel sending units?

Most replacement fuel tanks are sold as bare units without straps, brackets, or sending units. You'll typically need to purchase mounting straps ($75-150 per set), fuel sending units ($100-200 each), and potentially new fuel line fittings. Some suppliers offer complete kits that include all hardware, which can save time and ensure compatibility. Always verify what's included before ordering, as reusing old sending units in new tanks can cause inaccurate fuel gauge readings due to wear or incompatible float arm lengths.