15 Gallon Fuel Cell for Jeep TJ/LJ Fuel Pump Package

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The Motobilt MB5005-TJ was designed to use the stock Jeep TJ, LJ, JK, or JKU fuel pump and was designed to fit in the back bed of your Jeep. (See Notes) It is 30 inches L x 12 inches H x 9 inches W and can fit behind your seat if you choose. The tank has a capacity of roughly 15 US gallons. The Motobilt fuel tank is CNC cut from 1/8 inch aluminum and formed on a press brake, is TIG welded for ultimate strength and includes a large D-ring style cap. This can be converted to remote fill by purchasing a different filler neck system that utilizes a 12 bolt, 5.38 bolt circle flange. The Motobilt MB3000 fuel cell mount and MB5007 fuel pump clamping ring are included.

The mount consists of three parts: the main under-tank plate and two clamp bodies. The under tank plate is CNC Laser Cut from 1/8 inch high strength steel plate. You can weld your own mounting brackets to the bottom if needed or utilize the 8 bolt holes already in the mount. The 2 clamp-down bodies capture the top and all four sides of the tank and bolt securely to the mounting base. These parts are CNC Laser Cut but from 16 gauge steel. The parts are formed on a hydraulic press brake. This mount will ensure your fuel cell is mounted securely. The Motobilt tank features one fitting on top of the tank which has a rollover valve for a vent line. The MB5005-TJ Fuel Cell already has the provisions for the clamping ring CNC cut into the tank. This means the clamping ring and pump will bolt in with no cutting or drilling necessary!

This fuel cell is used for applications where you are extending the wheelbase and the rear axle would contact the factory fuel tank. It would also be used in situations where more ground clearance is needed. This kit works perfectly with the Motobilt Jeep TJ Back Half kit or Motobilt Jeep LJ back half kit, where the frame rails are moved up and in for ultimate clearance. This can also be installed in the back of your Jeep JK/JKU for custom applications.


  • Jeep TJ/LJ/JK/JKU aluminum fuel cell
  • MB3000 Fuel Cell Mount
  • MB50007 TJ fuel pump clamping ring
  • 30 inch L x 12 inch H x 9 inch W
  • 15 US gallons capacity
  • Brass rollover valve with 90-degree barbed fitting used for vent line. 1/2 NPT thread. The hose barb is 5/16".
  • -8 AN fitting used for return line on 2004-2006.  Earlier models will simply cap off this fitting.
  • CNC cut from 1/8 inch aluminum
  • Press brake-formed
  • Includes a large D-ring style cap
  • Under tank plate is CNC Laser Cut from 1/8 inch high-strength steel plate
  • Sold as kit
  • Weight = 44lbs


  • This Fuel Cell Does Not mount in between the frame rails. It will only mount inside the bed of the Jeep
  • A stock Jeep JK/JKU fuel pump will fit into this tank. 
  • The fuel filler cap assembly gasket can deteriorate due to ethanol. We recommend using the same Permatex 80016 Form-A-Gasket number 2 Sealant here also. 
  • 2006 TJ fuel pump requires the factory plastic to be slightly trimmed to fit the clamping ring.
  • 2005 & 2006 TJ's may require the seat to be remounted/moved in order to clear this fuel cell. 


Product Components


Installation Instructions (MB5007) Filler & Neck Cap Assembly