Peterbilt 379 Fuel Tanks

Frequently Asked Questions About Peterbilt 379 Fuel Tanks

What size fuel tanks fit a Peterbilt 379, and how do I determine the right capacity for my truck?

Peterbilt 379 trucks typically accommodate fuel tanks ranging from 100 to 150 gallons per side, with the most common sizes being 100, 120, and 150-gallon capacities. To determine the right size, measure the distance between your frame rails and the available space from the back of the cab to the rear suspension. Standard diameter tanks are 23-26 inches. Consider your typical haul distances and weight restrictions when selecting capacity. Most long-haul drivers prefer dual 120 or 150-gallon setups for extended range.

Are these fuel tanks compatible with all Peterbilt 379 model years (1987-2007)?

While the basic mounting dimensions remained consistent throughout the 379 production run, there are important differences to note. Pre-1995 models may require different strap configurations, and trucks with extended hoods might need specific bracket positioning. Always verify your truck's exact specifications, including wheelbase and cab configuration. Tanks designed for 379s will generally fit, but mounting hardware and fuel line routing can vary between early (1987-1994) and late model (1995-2007) trucks.

What material options are available, and which holds up best against road conditions?

Fuel tanks for Peterbilt 379s come in three primary materials: aluminum, aluminized steel, and stainless steel. Aluminum tanks are the most popular choice, offering excellent corrosion resistance and weight savings (approximately 50% lighter than steel). Polished aluminum requires regular maintenance to maintain shine but resists rust indefinitely. Stainless steel provides superior durability and maintains appearance longer but adds significant weight. Aluminized steel offers a budget-friendly option with decent corrosion resistance but typically lasts 5-7 years in harsh conditions versus 15-20+ years for aluminum.

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

Installation complexity depends on whether you're replacing existing tanks or adding new ones. Basic tank replacement typically requires 4-6 hours and standard tools including wrenches, jack stands, and fuel line disconnect tools. Critical steps include proper grounding, secure strap mounting with correct torque specs (typically 35-40 ft-lbs), and leak-free fuel line connections. Professional installation is recommended if you need to relocate crossmembers, modify fuel line routing, or install new sending units. Always drain tanks completely and follow safety protocols when working with fuel systems.

Do aftermarket fuel tanks affect my truck's resale value or warranty?

Quality aftermarket fuel tanks from reputable manufacturers typically maintain or can even increase resale value, especially if upgrading from smaller or damaged tanks. DOT-certified tanks that meet FMVSS standards are essential for legal compliance and safety. While Peterbilt's original warranty won't cover aftermarket parts, most tank manufacturers offer their own warranties ranging from 1-5 years. Keep installation records and ensure any modifications are reversible. Polished aluminum or stainless steel tanks in good condition are viewed favorably by buyers and can command premium prices in the used truck market.