RDS 40 Gallon Rectangle Notched Diesel Auxiliary Fuel Tank 1RDS 40 Gallon Rectangle Notched Diesel Auxiliary Fuel Tank 2RDS 40 Gallon Rectangle Notched Diesel Auxiliary Fuel Tank 3
Lead Time:  3-4 Weeks
Ships From: Florida

Add Diesel Install Kit?:

Tank Mounted Fuel Gauge?:

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Model: RDS-70387
Manufacturer: RDS Manufacturing

This is the RDS 40 Gallon Rectangle Notched Diesel Auxiliary Tank. An Ideal option for fifth wheel applications. Auxiliary tanks can be used as additional capacity for a factory tank with the use of an RDS diesel install kit. Shop for better fuel prices with this increased range. All tanks Meet DOT standards.

Diesel Install kits are optionally available. Made in the U.S.A.

NOTE: For safety reasons, the filler neck of these tanks prevents them from being overfilled. Actual usable tank capacity is about 95% of the total advertised gallons.


  • Special Permit issued by the US Department of Transportation (DOT)
  • Tank has a withdraw tube, return and drain fitting
  • Blank plate allows for the mounting of a fuel pump or gauge sending unit
  • Front corner fill
  • Aluminum diesel tank
  • Mounting brackets
  • Built in baffles to reduce movement of contents and sloshing
  • Pressure tested for leaks
  • Uses include diesel, water, fertilizer oil, bio fuel, combustible fuel
  • 1 year limited warranty

Please be aware that tanks/toolboxes may have mounting tabs that extend the dimensions of the tank by 1 inch on each side. This is NOT accounted for when viewing the displayed dimensions of the tanks/toolboxes. Please be sure to account for this when measuring for fitment of your tank/toolbox.

Detailed Information

RDS Auxiliary Rectangle Notched Fuel Tank Size

PDF  RDS Auxiliary Tank Installation Instructions

RDS Manufacturing
RDS Manufacturing Warranty Details:

RDS warrants all products to be free of defects in material or workmanship for a period of 1 year from invoice ship date from our warehouse. If upon our inspection we deem the item to be defective, RDS will determine whether to repair or replace the defective item. It is the customers responsibility to ship the item to RDS. No cost for labor, installation, or missing contents will be reimbursed. Damages due to shipping and handling, improper installation, abuse - intentional or accidental, or normal wear and tear are not covered by this warranty. Warranty is void if the tank has been altered.

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