Kenworth W900B/W900L Fuel Tanks

Frequently Asked Questions About Kenworth W900B/W900L Fuel Tanks

What size fuel tanks fit my Kenworth W900B or W900L, and how do I measure for the correct fit?

Kenworth W900B and W900L models typically accommodate fuel tanks ranging from 100 to 150 gallons, with 26-inch diameter tanks being the most common. To ensure proper fit, measure from the back of the cab to the center of your rear axle, then subtract 24 inches for adequate clearance. Also measure the available height from the frame rail to the bottom of the cab floor. Most W900B models (1987-2010) and W900L models (1988-present) use the same mounting brackets, but always verify your specific frame rail spacing, which is typically 34 inches for standard configurations.

Are aluminum or steel fuel tanks better for my W900, and what gauge thickness should I look for?

Aluminum tanks are the most popular choice for W900 models due to their lighter weight (approximately 50% lighter than steel) and excellent corrosion resistance. Look for tanks with a minimum thickness of 0.125 inches (1/8 inch) for aluminum or 14-gauge for steel. Premium aluminum tanks often feature 0.160-inch thickness for added durability. Steel tanks are more affordable upfront but require regular maintenance to prevent rust, especially in northern climates with road salt exposure. Most long-haul operators prefer aluminum for the weight savings and longevity.

Can I install these fuel tanks myself, and what tools or modifications are required?

Installation typically takes 3-4 hours per tank for experienced mechanics. You'll need basic hand tools, a floor jack, jack stands, and ideally a helper. Most direct-fit tanks for W900B/W900L models use existing mounting points and require no frame modifications. However, you may need to relocate or extend fuel lines, crossover lines, and sending unit wiring. Common challenges include aligning heavy tanks with mounting brackets and ensuring proper strap tension. Professional installation is recommended if you're uncomfortable working with fuel systems or lifting heavy components.

Do these fuel tanks come with steps, straps, and sending units, or are those sold separately?

Most fuel tanks are sold as bare units without accessories. You'll typically need to purchase separately: mounting straps (usually 2 per tank), sending units, fuel caps, and tank steps if desired. Some retailers offer complete kits that include polished aluminum straps and brackets, which can save money versus buying components individually. Verify whether your existing sending unit is compatible - most W900 models use standard 5-bolt SAE pattern sending units with 240-33 ohm resistance range.

What's the difference between round and D-shaped fuel tanks for my W900?

Round tanks are the traditional choice for W900 models, offering maximum capacity and a classic look. They typically mount lower on the frame and work well with standard length cabs. D-shaped (or rectangular) tanks mount flush against the frame rail, providing better ground clearance and a cleaner appearance. D-tanks are ideal for lowered trucks or those with custom side skirts but generally hold 10-15% less fuel than equivalent round tanks. Both styles use the same mounting strap systems on W900B and W900L models.