Frequently Asked Questions About Kenworth T300-T450 Diesel Fuel Tanks

What size fuel tanks are available for my Kenworth T300, T330, T340, or T450?

Standard fuel tank sizes for these models range from 50 to 150 gallons, with 70-gallon and 100-gallon options being the most common. The T300 and T330 typically accommodate tanks up to 100 gallons on each side, while the T340 and T450 can handle up to 150-gallon tanks depending on wheelbase and chassis configuration. Always verify your specific frame rail spacing and wheelbase before ordering, as tank fitment can vary based on your truck's year and configuration.

Will these fuel tanks fit my specific year model, and what about cross-compatibility?

Fuel tanks for T300 models (1994-2007) are generally interchangeable within that production run. The T330, T340, and T450 models (2008-present) share similar mounting patterns and can often use the same tanks. However, there are important exceptions: pre-2003 models may have different strap configurations, and trucks with hydraulic tanks or special body applications might require specific tank shapes. We recommend checking your existing tank's part number or providing your VIN for exact fitment verification.

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

Both aluminum and steel tanks are available. Aluminum tanks are 30-40% lighter than steel, won't rust, and are ideal for weight-sensitive applications or coastal environments. Steel tanks cost approximately 25-35% less, offer better puncture resistance, and are easier to repair if damaged. Most vocational truck operators choose aluminum for the weight savings and corrosion resistance, while budget-conscious buyers often select steel. Both materials meet DOT standards and typically last 10-15 years with proper maintenance.

What installation hardware comes with the tank, and what else will I need?

Most replacement tanks include the tank unit only. You'll typically need to purchase separately: mounting straps (usually 2-3 per tank), rubber mounting pads, sending unit (if not transferring from old tank), fuel pickup tube, and potentially new fuel lines and fittings. Installation generally takes 2-4 hours per tank for experienced mechanics. Common challenges include aligning strap mounting points on older trucks and ensuring proper clearance from exhaust components. Professional installation typically runs $200-400 per tank.

Can I add a larger fuel tank than what came stock on my truck?

Yes, many operators upgrade to larger tanks for extended range. The key limitations are frame rail spacing (typically 34 inches on these models), wheelbase length, and ground clearance requirements. Moving from a 70-gallon to a 100-gallon tank is usually straightforward. Going larger may require relocating DEF tanks, battery boxes, or tool boxes. Check local regulations as some states have restrictions on total fuel capacity. Also consider that larger tanks add weight (approximately 8.3 lbs per gallon for diesel) which reduces payload capacity.