Shop Peterbilt 357 & 378 Diesel Fuel Tanks

A top-notch aftermarket Peterbilt 378 fuel tank can be the best upgrade to your semi truck. We have a large selection of custom, chrome, and aftermarket fuel tanks to ensure you find one that fits your style and budget. Shop at 4 State Trucks to find fuel tanks from the best brands in the business for your Peterbilt.

Peterbilt 357/378 Diesel Fuel Tanks

The Peterbilt 357/378 Diesel Fuel Tanks product lineup features a wide range of high-quality fuel tanks designed to meet the needs of Peterbilt truck owners. From standard-size 100-150 gallon rear-fill tanks to specialty 80-135 gallon center-fill and front-fill options, this product lineup has something for every Peterbilt model. The tanks are constructed with durable aluminum and stainless steel materials, ensuring long-lasting performance and corrosion resistance. Many feature aircraft-style filler necks and innovative designs to maximize storage capacity within the available space. Whether you need to upgrade your fuel system or replace a worn-out tank, the Peterbilt 357/378 Diesel Fuel Tanks product lineup has the high-quality, American-made solutions you can depend on. These fuel tanks offer the perfect blend of functionality, quality, and value to keep your Peterbilt running strong.

Frequently Asked Questions About Peterbilt 357/378 Diesel Fuel Tanks

What size fuel tanks fit my Peterbilt 357 or 378, and how do I determine the correct capacity?

Peterbilt 357 and 378 models typically accommodate fuel tanks ranging from 50 to 150 gallons, with 100-gallon and 120-gallon tanks being the most common. To determine your correct size, check your door jamb sticker for OEM specifications or measure your existing tank's dimensions (length x diameter). Most 357/378 models from 1987-2007 use standard 25-inch diameter tanks, but always verify your frame rail spacing and step box clearance before ordering.

Are these fuel tanks compatible with both the Peterbilt 357 and 378, or do I need model-specific tanks?

Most fuel tanks are interchangeable between the 357 and 378 models since they share the same frame rail configurations and mounting systems. However, differences may exist based on your specific year and wheelbase configuration. Extended hood 378 models may require different strap lengths or mounting brackets. Always provide your VIN or model year when ordering to ensure proper fitment.

What material options are available, and which is best for my application?

You can choose between aluminum and steel fuel tanks. Aluminum tanks are lighter (reducing overall vehicle weight by 50-100 pounds), resist corrosion better, and are ideal for over-the-road applications. Steel tanks cost less upfront and offer better puncture resistance for construction or off-road use. Both materials meet DOT requirements, but aluminum tanks typically last 15-20 years versus 10-12 years for steel in normal conditions.

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

While experienced mechanics can install these tanks, we recommend professional installation due to safety and regulatory requirements. Installation involves disconnecting fuel lines, electrical connections (for sending units), and properly torquing mounting straps to 35-45 ft-lbs. You'll need to ensure proper grounding, install new fuel line fittings, and may need to recalibrate your fuel gauge. Most installations take 2-4 hours per tank.

Do these replacement tanks come with mounting hardware and sending units?

Most replacement fuel tanks come as bare tanks without mounting straps, sending units, or fuel pickups. You'll typically need to transfer these components from your old tank or purchase them separately. Some retailers offer complete kits that include D-style mounting straps, rubber isolators, and hardware. Sending units are usually sold separately and must match your fuel gauge type (240-33 ohm is standard for most 357/378 models).