top of page

School Bus Fuel Tank Replacement: Fitment Guide for Blue Bird, Freightliner, and IC Bus

  • Apr 19
  • 3 min read

Updated: 6 hours ago

School bus fuel tank replacement is not a straight swap. Capacity alone does not determine fitment. Strap spacing, fill neck position, and frame rail clearance all vary by make and configuration - getting any one wrong means the tank does not mount correctly. Always provide your OEM part number when ordering to confirm fitment before anything ships.




How Many Gallons Does a School Bus Fuel Tank Hold?

Capacity varies by make, model year, and whether the bus runs diesel or gas, but full-size school bus fuel tanks generally run 60 to 100 gallons. The common replacement sizes by make are:

  • Blue Bird: 45, 60, 90, and 100 gallon.

  • IC Bus (Navistar): 35, 60, 65, and 100 gallon.

  • Freightliner and Thomas: 31, 35, 60, 62, 75, and 100 gallon.

Fill neck position and strap spacing change by configuration, so match a replacement to your exact make, model year, and capacity, not to the tank that looks closest.

School Bus Fuel Tank Replacement: Four Variables That Determine Fitment


These four variables must all be confirmed before ordering a replacement tank. Ordering on any single variable - especially capacity - is how a fuel tank comes back wrong.


  1. Tank capacity - a capacity change typically changes overall dimensions as well

  2. Overall dimensions (length, width, height) - determine whether the replacement fits the frame rail space

  3. Strap spacing - the distance between mounting strap bands must match existing hardware exactly

  4. Fill neck position and angle - must connect to the existing fill tube without modification


Which Fuel Tank Fits a Freightliner FS65?


The Freightliner FS65 is the most common Freightliner school bus chassis. Tanks mount outboard on the passenger-side frame rail with two strap bands. The 60-gallon and 80-gallon configurations are not dimensionally interchangeable - strap spacing differs between them.


  • Standard 60-gallon FS65 tank: part FRLGT7001 - confirm OEM before ordering

  • Some configurations ran 80-gallon - confirm original capacity from chassis spec sheet or measure strap spacing


Which Fuel Tank Fits an IC Bus?


IC Bus CE Series and RE Series use different fuel tanks. They are not interchangeable. Always confirm series from the chassis data plate before ordering.


  • IC Bus CE Series: part NAVGT30C91 - call to confirm fitment by year

  • IC Bus FE Series: part NAVGT10C92 - call to confirm fitment by year

  • Older units may show International or Navistar on the data plate - confirm OEM number either way


Which Fuel Tank Fits a Blue Bird School Bus?


Blue Bird Vision and All American mount the fuel tank at different chassis positions. The tanks are not interchangeable between body styles. Confirm body style from the chassis data plate before ordering, and provide the OEM part number to verify fitment for your specific year.


What to Confirm Before Ordering a School Bus Fuel Tank


Have this information ready before placing any fuel tank order. Photograph the installed tank before removal - strap positions, fill neck, and fuel line connections:


  • OEM part number - most reliable confirmation method

  • Bus make and chassis model (chassis data plate)

  • Original tank capacity in gallons

  • Strap spacing - measure between the two mounting band centers

  • Fill neck position and angle

  • Model year


Call 800-247-5391 or contact our team with your bus make, OEM part number, and strap spacing to confirm fitment.



Frequently Asked Questions


Can I replace a 60-gallon school bus fuel tank with an 80-gallon tank?


Not without confirming strap spacing, fill neck position, and frame rail clearance. Capacity changes often come with dimensional changes that affect fitment. Confirm all three before ordering a different-capacity replacement.


What causes a school bus fuel tank to need replacement rather than repair?


Seam corrosion that cannot be sealed, strap mounting flange failure, and structural cracks from impact or fatigue are the primary reasons. A leaking tank near the frame rail or fuel system components is a safety issue and requires replacement, not patching.

bottom of page