Peterbilt 567/579 Fuel Tanks

Frequently Asked Questions About Peterbilt 567/579 Fuel Tanks

What are the main differences between aluminum and steel fuel tanks for my Peterbilt 567/579?

Aluminum fuel tanks are approximately 40-50% lighter than steel tanks, improving fuel economy and payload capacity. They resist corrosion better and won't rust, but they're more expensive upfront. Steel tanks cost less initially and are more resistant to impact damage, but they're heavier and require more maintenance to prevent rust. Most owner-operators prefer aluminum for long-haul applications, while steel remains popular for vocational trucks that face rougher conditions.

Will aftermarket fuel tanks fit my specific Peterbilt model year, and what modifications might be needed?

Most aftermarket fuel tanks for Peterbilt 567/579 models fit trucks from 2013 onwards without major modifications. However, trucks with emissions equipment from 2017+ may require repositioning of DEF tanks or exhaust components. Pre-2016 models might need different mounting brackets. Always verify your truck's specific configuration, including wheelbase, exhaust routing, and existing tank strap spacing before ordering. Some installations require relocating crossmembers or modifying fuel line routing.

What tank sizes and configurations work best for different applications?

For long-haul applications, dual 120-150 gallon tanks (240-300 gallons total) provide optimal range. Regional haulers typically run 80-100 gallon configurations. Vocational trucks often use single 100-120 gallon tanks to save weight and maintain ground clearance. Round tanks offer better fuel flow and easier cleaning, while D-shaped tanks maximize capacity in tight spaces. Consider your typical routes, weight restrictions, and frame rail spacing when selecting capacity.

How difficult is the installation process, and what tools or expertise do I need?

Installing fuel tanks typically takes 4-6 hours per tank for experienced technicians. You'll need basic hand tools, a transmission jack or tank jack, and potentially a drill for new mounting holes. Critical steps include properly torquing tank straps (typically 35-45 ft-lbs), ensuring correct fuel line routing with no kinks, and maintaining proper tank-to-ground clearance (minimum 14 inches loaded). Many operators report crossover line installation and fuel sender calibration as the most challenging aspects. Professional installation is recommended if you're unfamiliar with fuel system work.

What finishes hold up best against road chemicals and weather?

Polished aluminum tanks require regular maintenance with aluminum polish to prevent oxidation and water spotting, especially in winter climates with road salt. Brushed aluminum finishes hide minor scratches better and need less frequent polishing. Powder-coated steel tanks offer excellent protection when the coating remains intact but can rust quickly if chipped. For maximum durability with minimal maintenance, many drivers choose brushed aluminum or apply protective film to polished surfaces. Avoid harsh cleaners and pressure washing directly on tank sensors and fittings.