Frequently Asked Questions About Peterbilt 330/335/337 Diesel Fuel Tanks

What are the exact model years these fuel tanks fit, and are there any compatibility issues I should know about?

These fuel tanks are designed to fit Peterbilt 330, 335, and 337 models from 2005 through 2015. However, compatibility can vary based on your truck's specific configuration, wheelbase, and whether it has a DEF system. Models from 2011-2015 with DEF tanks may require different mounting brackets or tank configurations. We recommend checking your VIN and original tank specifications before ordering to ensure proper fitment.

What's the difference between aluminum and steel fuel tanks, and which material holds up better?

Aluminum tanks are lighter (reducing overall vehicle weight by 50-70 pounds), resist corrosion better, and typically last longer in harsh weather conditions. Steel tanks are more affordable upfront and can handle physical impacts better, but they're prone to rust, especially in areas using road salt. Most customers in northern climates prefer aluminum for longevity, while those prioritizing initial cost savings often choose steel. Both materials meet DOT requirements when properly maintained.

Can I install these fuel tanks myself, or do I need professional help? What tools are required?

While experienced mechanics can complete the installation in 2-4 hours, we recommend professional installation due to fuel system safety concerns. The job requires draining existing fuel, disconnecting fuel lines and electrical connections, and properly torquing mounting straps to 35-40 ft-lbs. Essential tools include a fuel transfer pump, line disconnect tools, torque wrench, and proper lifting equipment. Improper installation can lead to fuel leaks or tank damage not covered under warranty.

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

Common sizes range from 50 to 150 gallons, with 100-gallon tanks being the most popular for these models. Your choice depends on your typical route length, payload requirements, and frame rail spacing. Measure from the back of the cab to the rear spring hanger to determine maximum tank length. Remember that larger tanks add weight and may affect payload capacity. Dual tank setups are available for extended range needs.

Are these tanks sold with mounting hardware and straps, or do I need to purchase separately?

Tank packages vary by manufacturer. Most aluminum tanks include basic mounting brackets but require you to purchase straps, sending units, and fuel caps separately. Steel tanks often come as tank-only units. Complete installation typically requires tank straps ($45-75 per set), rubber isolation strips ($15-25), sending unit if not transferring from old tank ($125-200), and various fittings. Always verify what's included before ordering to avoid installation delays.