Stretch Underbody Fuel Cell for TJ / LJ Motobilt

Motobilt Stretch Underbody Fuel Cell MB5020 for TJ / LJ drawing that shows this installed with a gm 14 bolt rear axle with 6"s of stretch and dimensions are shown

Motobilt Stretch Underbody Fuel Cell MB5020 for TJ / LJ picture shown

MB5020

Stretch Underbody Fuel Cell for TJ / LJ

Name: Stretch Underbody Fuel Cell for TJ / LJ
Brand: Motobilt
SKU: MB5020
Price: 999.00 USD
Availability: InStock
Rating: 4.5 (2 reviews)

$999.00

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Compatible With:

LJTJ

Select Option: Fuel Cell Only

Fuel Cell Only Fuel Cell with Pigtail Adapter (for TJ's Older Than 2005)

Product variants

Quantity

Rear stretch fuel cell for Jeep TJ and LJ with 14.5 gallon capacity, skid plate, and support for up to 6 inch wheelbase stretch.

Assembly Instructions

Select Option: Fuel Cell Only

Fuel Cell Only Fuel Cell with Pigtail Adapter (for TJ's Older Than 2005)

Once a Jeep TJ or LJ build moves into stretched wheelbase territory, the factory fuel tank becomes a major obstacle. The stock tank location limits rear axle placement, interferes with suspension travel, and makes it difficult to package larger axles and link systems under the Jeep. Builders trying to stretch the wheelbase quickly run out of room unless the fuel system is addressed.

The Motobilt Stretched TJ Fuel Cell is designed to solve that problem while keeping the tank mounted underneath the vehicle. This system allows up to 6 inches of rear wheelbase stretch depending on axle choice, giving builders the room needed for proper suspension geometry and axle placement. It installs in the factory tank location, so it works whether you are stretching the Jeep or simply upgrading the fuel system for better durability and packaging.

The tank is a 14.5 gallon aluminum fuel cell built from 1/8 inch thick aluminum, CNC cut, formed, and TIG welded for strength and long-term reliability. The fill and vent tubes are CNC machined and positioned to work with factory-style routing using 1997-2002 TJ filler and vent hoses. The top of the tank includes a rollover valve and an 8AN vent fitting for proper fuel system ventilation. A machined mounting location is built into the tank to accept a 2005-2006 TJ fuel pump, secured with a steel clamping ring and hardware.

The fuel cell is protected by a fully welded 3/16 inch steel skid plate that mounts directly to the factory TJ frame. Steel hold-down straps secure the tank to the skid, creating a strong and protected system designed for rock crawling and hard trail use. This setup is built for builders who want to stretch their TJ the right way without giving up a protected underbody fuel system.

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Important Information

Fits Jeep Wrangler TJ / LJ 1997-2006
Designed for rear stretch applications up to 6 inches depending on axle setup
Installs in factory fuel tank location
Can be installed without stretching the wheelbase
Does not require a body lift
Works with factory exhaust routing
Uses 2005-2006 Jeep TJ fuel pump only
Pigtail adapter required for 2004 and earlier TJ models
Factory fuel filler hose and vent from 1997-2002 TJ required
2003-2006 TJ models must use earlier style filler and vent hoses
Includes rollover valve and 8AN vent fitting
Fuel pump seal not included. Uses Mopar #55366298AA
Ships raw aluminum tank and raw steel skid plate
Not compatible with Motobilt TJ or LJ Back Half Kit
Designed for off-road use only
Approximate weight 50 lbs

Product Specifications

Vehicle Fitment
Jeep Wrangler TJ / LJ 1997-2006

Part Type
Rear stretch fuel cell with skid plate
Fuel Capacity
14.5 gallons

Tank Material
1/8 inch aluminum
Skid Plate Material
3/16 inch steel
Fuel Pump Compatibility
2005-2006 Jeep TJ fuel pump only
Vent System
Rollover valve and 8AN vent fitting
Included Components
Aluminum fuel cell
Steel skid plate
Steel hold-down straps
Fuel pump clamping ring and mounting hardware
Weight
50 lbs approximate
Finish
Tank raw aluminum
Skid plate bare steel
Manufactured
Made in the USA

Notes

Test fit all components before final paint or powder coat.
Use only a 2005-2006 TJ fuel pump. Earlier pumps are not compatible.
2004 and earlier TJ models require a pigtail adapter to run the newer fuel pump.
Fuel pump seal (Mopar #55366298AA) is required but not included.
Use 1997-2002 TJ fuel filler hose and vent tube for proper fitment.
When routing the vent hose from the rollover valve, loop the hose around the tank before exiting underneath the Jeep.
If running EVAP, tie the vent line into that system.
Works with a wide range of rear axles including GM 14 bolt,
Ford Sterling 10.25/10.5, Dana 60, Dana 44, and Ford 8.8.
Not compatible with Motobilt TJ or LJ Back Half Kit.
Professional installation recommended for builders performing rear stretch modifications.

Frequently Asked Questions

Is this a stretch fuel tank or just a replacement tank?
This is a true stretch fuel tank. It is designed to allow up to 6 inches of rear wheelbase stretch while staying in the factory tank location.

Do I have to stretch my Jeep to use this tank?
No. The tank installs in the factory location and can be used without stretching the wheelbase, but it is designed to support stretched builds.

What fuel pump does this tank use?
This tank is designed to use a 2005-2006 Jeep TJ fuel pump only. Earlier TJ fuel pumps are not compatible.

Will this work with one ton axles?
Yes. This tank is designed to work with a wide range of axle options including GM 14 bolt, Ford Sterling, Dana 60, Dana 44, and Ford 8.8 axles.

Do I need a body lift to install this tank?
No. This system is designed to install without a body lift.