Peterbilt 386 Diesel Fuel Tanks Peterbilt 386 diesel fuel tanks come in a wide range of sizes and configurations to meet the diverse needs of Peterbilt 386 owners. Whether you need a 50-gallon side-mount reservoir, a 100-gallon rear-fill tank, or a 135-gallon rear-fill tank, there are plenty of options available to ensure your Peterbilt 386 has the fuel capacity it requires. Many of these tanks are designed with features like aircraft-style fillers, aluminum construction, and custom dimensions to seamlessly integrate with the Peterbilt 386 chassis. Regardless of your specific fuel tank needs, this product lineup offers a comprehensive selection of high-quality, durable diesel fuel tank solutions engineered specifically for the Peterbilt 386.