Peterbilt 359 Diesel Fuel Tanks

Frequently Asked Questions About Peterbilt 359 Diesel Fuel Tanks

What size fuel tanks fit my Peterbilt 359, and how do I determine the correct capacity?

Peterbilt 359 trucks typically accommodate fuel tanks ranging from 50 to 150 gallons per side. To determine the right size, measure from the back of the cab to the rear suspension brackets and check your frame rail spacing. Most 359 models use 26-inch diameter round tanks. Consider your typical haul distances and weight restrictions when selecting capacity. Remember that dual 150-gallon tanks are the most common configuration for long-haul 359s.

Will these fuel tanks fit all Peterbilt 359 model years?

While most fuel tanks are compatible across Peterbilt 359 models from 1967 to 1987, there are important variations to consider. Early models (1967-1972) may have different strap mounting points compared to later years. Extended hood models require specific tank lengths to avoid interference with the battery box or air cleaners. Always verify your truck's wheelbase and measure the available space between the cab and drive axles before ordering.

What's the difference between aluminum and steel fuel tanks, and which should I choose?

Aluminum tanks are 65% lighter than steel equivalents, resist corrosion better, and won't rust from water contamination in diesel fuel. However, they cost 30-40% more upfront. Steel tanks are more affordable and extremely durable but require regular inspection for rust, especially in regions using road salt. Most owner-operators prefer aluminum for weight savings and longevity, while fleet operators often choose steel for initial cost savings. Both materials meet DOT requirements when properly maintained.

Can I install these fuel tanks myself, or do I need professional help?

Installation requires moderate mechanical skills and specific tools including a floor jack, torque wrench, and fuel line disconnect tools. The process typically takes 4-6 hours per tank and involves draining existing fuel, removing old tanks, transferring mounting straps and hardware, and ensuring proper fuel line connections. Critical steps include torquing strap bolts to 45-50 ft-lbs and checking all connections for leaks. While experienced mechanics can handle this job, professional installation is recommended if you're unfamiliar with fuel system work or lack proper lifting equipment.

Do these replacement tanks come with mounting straps, fuel sending units, and other necessary hardware?

Most replacement fuel tanks are sold as tank-only units without mounting hardware, sending units, or fuel pickups. You'll typically need to transfer these components from your old tanks or purchase them separately. Essential items to check include: mounting straps and bolts, rubber isolator pads, fuel sending units (if your truck has fuel gauges), drain plugs, and fuel pickup tubes. Some retailers offer complete kits that include these components, which can save time and ensure compatibility.