Reinforced Bottom Plate
A reinforced 5mm bottom plate improves durability and provides additional protection in uneven terrain and off-road driving conditions.
PROJECT // AUXILIARY FUEL SYSTEM
REV. 2026 / v1.1
LX700H AUXILIARY FUEL TANK 52L
52L auxiliary fuel system utilizing a gravity-fed siphon design to automatically transfer fuel into the main tank, extending range without pumps, switches, or electronic complexity.
TOTAL CAPACITY
120L
EST.RANGE INCREASE
410km - 490km+
PRIMARY MATERIAL
Aluminum-Magnesium Alloy
Vehicle Fitment
MODELLX700H
YEAR2024+
ENGINE3.5TT
FUELHybrid Gasoline
DATA SHEET
TECHNICAL SPECIFICATIONS
ENGINEERING DATA LOG
| MATERIAL | Aluminum-Magnesium Alloy |
|---|---|
| MOUNT POSITION | Chassis Side Mount |
| NET WEIGHT | 12KG |
| GROUND CLEARANCE | MINIMAL(＜10MM) |
| COATING | Textured Black Powder Coat |
Capacity & Range
TOTAL FUEL VOLUME
120L
Factory: 68L + Fuken: 52L
EST. RANGE INCREASE
410km - 490km+
Fuel System Logic
SYSTEM TYPE
Automatic Cyclic Siphon Transfer
Automated siphon-based transfer system. The auxiliary tank replenishes the main tank in calculated cycles, maintaining optimal fuel levels without manual switches or external pumps.
Gauge Behavior: OEM gauge displays the main tank. During driving, the range (DTE) will periodically "reset" or increase as the auxiliary tank completes up to 3 replenishment cycles. This cycling is normal behavior. Once the auxiliary tank is empty, the gauge will decline steadily to the low-fuel warning.
Structure & Protection Design
01
02
Internal Baffle System
Internal baffles help control fuel movement inside the tank, improving vehicle stability and fuel pickup reliability on uneven terrain.
03
Heat Shield Protection
Integrated heat shielding reduces exhaust heat exposure and helps protect fuel system components from excessive temperature.
04
Strap Shield Protection System
Recessed mounting pockets allow the tank straps to sit flush within protected zones, reducing the risk of strap damage or snagging when sliding over obstacles off-road.
05
Quick-Connect Fuel Line Fittings
Equipped with OEM-style quick-connect fittings for secure sealing, simplified installation, and reliable fuel line connections.
06
Integrated Drain Port
An integrated drain port allows fuel to be safely drained for maintenance, repairs, or long-term storage without removing the tank.
07
Direct Bolt-On Installation
Designed to mount to factory locations using original mounting points. No chassis cutting, drilling, or permanent modifications required.
08
Individual Serial Identification
Each tank is marked with a unique serial number for product identification, quality tracking, and authenticity verification.
Weight & Material Engineering
Designed to reduce weight without compromising strength, ideal for long-range and overland use.
ENGINEERING CHOICE
Fuken ALUMINUM TANK
12KG
- MATERIALAL 5052
- PROTECTIONNATIVE ANTI-RUST
- BEST FOROVERLANDING
TYPICAL ALTERNATIVE
TRADITIONAL STEEL
34KG
- MATERIALMILD STEEL
- COATINGEASY TO CORRODE
- IMPACTHIGH CHASSIS LOAD
TECH DOC // INSTALLATION
Installation & Technical Notes
EST. TIME
2-3 Hours
DIFFICULTY
Bolt-on with Pump Integration
CHASSIS MOD
NONE
EXHAUST MOD
NONE
PUMP MOD
REQUIRED
FIG. 01 // TECHNICAL SCHEMATIC
FIG. 02 // TECHNICAL SCHEMATIC
FUEL PUMP MODIFICATION
To integrate the auxiliary fuel tank system, a siphon valve is installed onto the original fuel pump assembly. This requires slightly enlarging the existing access slot on the OEM fuel pump housing to approximately 5 cm, as shown below.
What's In The Box
NO Electronic Add-ons: No pumps or control units.
NO Main Tank Modification: Factory tank body remains untouched.
NO Interior Space Loss: Side-mounted underbody layout with bolt-on installation. No cutting or welding to the chassis or vehicle body.
Complete Kit: Includes 52L tank, siphon hardware, and fittings.
NO Main Tank Modification: Factory tank body remains untouched.
NO Interior Space Loss: Side-mounted underbody layout with bolt-on installation. No cutting or welding to the chassis or vehicle body.
Complete Kit: Includes 52L tank, siphon hardware, and fittings.
Installation Video Guide
SYSTEM VARIANTS
Other Engineering Configurations
Global Shipping
Available to most countries. Professional logistics network for oversized automotive parts.
Secure Packaging
Reinforced packaging engineered for heavy-duty fuel systems and long-distance maritime transport.
Delivery Time
Estimated 25–40 days depending on destination and selected shipping method (Sea/Air/Rail).
LONG-TERM ASSURANCE
3-YEAR WARRANTY & SUPPORT
Built to support long-term ownership, not just short-term trips. We provide transparent coverage for the life of your expedition rig.
TANK BODY
3-YEAR STRUCTURE
Full structural coverage against manufacturing defects under normal off-road usage.
COMPONENTS
LIFETIME SUPPORT
Ongoing technical support and replacement parts availability for original owners.