International 9900/i/ix Fuel Tanks

Frequently Asked Questions About International 9900/i/ix Fuel Tanks

What are the exact model years and compatibility for International 9900 series fuel tanks?

International 9900/i/ix fuel tanks are designed to fit 9900i models from 1999-2004 and 9900ix models from 2005-2016. The mounting brackets and strap configurations differ between the 9900i and 9900ix, so you'll need to verify your specific model year before ordering. The easiest way to confirm compatibility is to check your OEM or measure your existing tank's mounting bracket spacing - 9900i models typically have 24-inch centers while 9900ix models use 26-inch centers.

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

Aluminum tanks are lighter (saving 100-150 lbs per tank), resist corrosion better, and typically last 15-20 years with proper maintenance. Steel tanks cost 30-40% less upfront but are heavier and more prone to rust, especially in northern climates with road salt. Most owner-operators prefer aluminum for the weight savings and longevity, while fleet operators often choose steel for the lower initial cost. Consider your routes, climate, and how long you plan to keep the truck.

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

While experienced mechanics can install fuel tanks themselves, we recommend professional installation due to DOT regulations and safety concerns. Installation typically takes 3-4 hours per tank and requires proper lifting equipment, torque specifications for mounting brackets (typically 75-85 ft-lbs), and fuel system bleeding. You'll also need to transfer sending units and potentially modify fuel lines. Many customers report that dealer installation costs $300-500 per tank but ensures proper mounting and compliance.

What tank sizes and configurations are available for the 9900 series?

Standard configurations include 100, 120, and 150-gallon capacities in both round and D-shaped designs. Round tanks offer maximum capacity but extend further from the frame, while D-tanks sit flatter against the chassis for better ground clearance. Dual tank setups are common, with popular combinations being dual 120s (240 gallons total) or dual 150s (300 gallons total). Step tanks are also available for easier cab access, though they reduce capacity by 10-15 gallons.

How do I maintain my fuel tanks to maximize their lifespan?

Regular maintenance includes checking mounting straps every 6 months for wear (replace if cracked or stretched), inspecting for leaks at all fittings, and keeping tanks at least 1/4 full to prevent condensation. For aluminum tanks, use only aluminum-safe cleaners and avoid steel wool. Steel tanks benefit from annual rust prevention coating on the bottom surfaces. Many drivers report tank failures at 8-10 years due to neglected strap maintenance, so investing in quality rubber-isolated straps can double tank life.