Skip to content

Auxiliary Fuel Tanks

Shop auxiliary fuel tanks for your truck or SUV. Filter by vehicle to see only the auxiliary fuel tanks confirmed to fit yours.

S&B 55 Gallon High-Capacity Fuel Tank | 2006-2024 Dodge / Ram Mega Cab Short Bed - Underland Offroad
S&B 55 Gallon High-Capacity Fuel Tank | 2006-2024 Dodge / Ram Mega Cab Short Bed

S&B 55 Gallon High-Capacity Fuel Tank | 2006-2024 Dodge / Ram Mega Cab Short Bed

S&B Filters
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

Important Notes: The fuel gauge will continue to work however the distance to empty will not be accurate. There is no way to update the fuel tank ...

View full details
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00
S&B 65 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Long Bed - Underland Offroad
S&B 65 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Long Bed

S&B 65 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Long Bed

S&B Filters
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

  Important Note about the Fuel Gauge Operation: The distance to empty (DTE) on GM trucks can’t be reprogrammed, so it will show about half the ...

View full details
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00
S&B 70 Gallon High-Capacity Fuel Tank | 2011-2016 Ford F-250 / F-350 / F-450, 6.7L Powerstroke, Crew Cab, Long Bed - Underland Offroad
S&B 70 Gallon High-Capacity Fuel Tank | 2011-2016 Ford F-250 / F-350 / F-450, 6.7L Powerstroke, Crew Cab, Long Bed

S&B 70 Gallon High-Capacity Fuel Tank | 2011-2016 Ford F-250 / F-350 / F-450, 6.7L Powerstroke, Crew Cab, Long Bed

S&B Filters
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

Important Notes: The nozzle at high-flow fuel stations (truck stops) will not be able to fill automatically.S&B's 70-gallon fuel tank replaces ...

View full details
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00
S&B 40 Gallon (After Axle) High-Capacity Fuel Tank 2000-2010 Ford Powerstroke 7.3L, 6.0L, 6.4L F-350, F-450, F-550 Cab Chassis - Underland Offroad
S&B 40 Gallon (After Axle) High-Capacity Fuel Tank 2000-2010 Ford Powerstroke 7.3L, 6.0L, 6.4L F-350, F-450, F-550 Cab Chassis

S&B 40 Gallon (After Axle) High-Capacity Fuel Tank 2000-2010 Ford Powerstroke 7.3L, 6.0L, 6.4L F-350, F-450, F-550 Cab Chassis

S&B Filters
$899.00 - $899.00
$899.00
$899.00 - $899.00
$899.00

Important Note: Skid plates and straps are NOT included. These parts are reused. Torque Spec is 30 in/lbs for sending unit nuts Do you have an Auxi...

View full details
$899.00 - $899.00
$899.00
$899.00 - $899.00
$899.00
S&B 62 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Short Bed - Underland Offroad
S&B 62 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Short Bed

S&B 62 Gallon High-Capacity Fuel Tank | 2004-2010 GM Duramax 6.6L LLY, LBZ, LMM Crew Cab Short Bed

S&B Filters
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

Important Note about the Fuel Gauge Operation: The distance to empty (DTE) on GM trucks can’t be reprogrammed, so it will show about half the mi...

View full details
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00
S&B 68 Gallon High-Capacity Fuel Tank | 2017-2027 Ford F-250 / F-350 / F-450 Powerstroke 6.7L Crew Cab Long Bed - Underland Offroad
S&B 68 Gallon High-Capacity Fuel Tank | 2017-2027 Ford F-250 / F-350 / F-450 Powerstroke 6.7L Crew Cab Long Bed

S&B 68 Gallon High-Capacity Fuel Tank | 2017-2027 Ford F-250 / F-350 / F-450 Powerstroke 6.7L Crew Cab Long Bed

S&B Filters
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

Important Notes:  This tank holds approximately 68 gallons of fuel. The float's empty position in the S&B Tank is the same as the OEM tank. Si...

View full details
$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00
S&B 40 Gallon (After Axle) High-Capacity Fuel Tank | 2011-2016 Ford F250, F350, F450, F550 Powerstroke 6.7L, Cab Chassis - Underland Offroad
S&B 40 Gallon (After Axle) High-Capacity Fuel Tank | 2011-2016 Ford F250, F350, F450, F550 Powerstroke 6.7L, Cab Chassis

S&B 40 Gallon (After Axle) High-Capacity Fuel Tank | 2011-2016 Ford F250, F350, F450, F550 Powerstroke 6.7L, Cab Chassis

S&B Filters
$899.00 - $899.00
$899.00
$899.00 - $899.00
$899.00

Important Note: The nozzle at high-flow fuel stations (truck stops) will not be able to fill automatically. Skid plates and straps are NOT included...

View full details
$899.00 - $899.00
$899.00
$899.00 - $899.00
$899.00
S&B 56 Gallon High-Capacity Fuel Tank | 2011-2016 Ford Powerstroke 6.7L Crew Cab Short Bed - Underland Offroad
S&B 56 Gallon High-Capacity Fuel Tank | 2011-2016 Ford Powerstroke 6.7L Crew Cab Short Bed

S&B 56 Gallon High-Capacity Fuel Tank | 2011-2016 Ford Powerstroke 6.7L Crew Cab Short Bed

S&B Filters
$1,349.00 - $1,349.00
$1,349.00
$1,349.00 - $1,349.00
$1,349.00

Important Note: The nozzle at high-flow fuel stations (truck stops) will be able to fill automatically. This tank now reuses the OE Float. Do you h...

View full details
$1,349.00 - $1,349.00
$1,349.00
$1,349.00 - $1,349.00
$1,349.00