Frequently Asked Questions About Freightliner M2 Business Class Diesel Fuel Tanks

What fuel tank sizes are available for my Freightliner M2, and how do I determine the right capacity?

Freightliner M2 Business Class trucks typically accommodate fuel tanks ranging from 50 to 150 gallons, with 60, 80, and 100-gallon tanks being the most common. To determine the right capacity, check your door jamb sticker for the original tank size, measure your existing tank (length x height x width), or look for the tank's data plate. Consider your typical route distances and payload requirements when selecting capacity - longer hauls benefit from larger tanks, while local delivery trucks may prefer smaller tanks to save weight and space.

Are these fuel tanks compatible with all M2 model years, and what about the 106 and 112 variants?

Fuel tank compatibility varies significantly across M2 model years and variants. Tanks for 2003-2017 models often differ from 2018+ models due to emission system changes and frame rail modifications. The M2 106 and M2 112 models have different frame rail spacing, requiring variant-specific tanks. Always verify compatibility using your VIN number and confirm the tank mounting strap spacing matches your truck. Step tanks and cylinder tanks may have different mounting requirements even within the same model year.

What material options are available, and which is best for my application?

You'll find three primary material options: aluminum, steel, and aluminized steel. Aluminum tanks are 40-50% lighter than steel, resist corrosion, and are ideal for weight-sensitive applications but cost more. Steel tanks are more affordable and durable against impacts but require maintenance to prevent rust. Aluminized steel offers a middle ground with better corrosion resistance than plain steel at a moderate price point. For coastal areas or regions using road salt, aluminum or aluminized steel provides the best long-term value.

Can I install a replacement fuel tank myself, or do I need professional installation?

While fuel tank replacement is possible for experienced DIYers, it requires specific safety precautions and tools. You'll need proper jack stands, fuel transfer equipment, and the ability to safely handle 100+ pound tanks. The process involves draining existing fuel, disconnecting fuel lines and sending units, removing mounting straps, and ensuring proper ground connections. Many customers report 3-5 hour installation times. Professional installation is recommended if you're uncomfortable working with fuel systems or lack proper lifting equipment. Always check local regulations as some areas require certified technician installation.

What additional components do I need when replacing my fuel tank?

A complete fuel tank replacement typically requires more than just the tank itself. You'll need new mounting straps and hardware (often sold separately), fuel tank sending unit if not included, rubber mounting isolators, and new fuel lines or connection fittings if yours are worn. Consider replacing the fuel cap, anti-siphon device, and fuel tank venting components at the same time. Some installations may require a new fuel gauge sending unit specific to your tank's dimensions. Budget an additional $150-300 for these supporting components beyond the tank cost.