---
title: "Fuel Tank"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:FUEL_TANK"
  data_integrity_hash: "daa4a6b6c73e93cdeab88f5f7d02eae6"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:FUEL_TANK"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/fuel-tank.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/fuel-tank"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-5.0 bar"
    unit: "L"
engineering_limits:
  max_safe_operating_point:
    value: 6.8
    unit: "bar"
    consequence: "Yield strength of ASTM A36 steel (250 MPa) exceeded at 6.8 bar internal pressure in cylindrical tank geometry with 2:1 length:diameter ratio and 3 mm wall thickness"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Microbial contamination of diesel fuel (Cladosporium resinae growth)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Biocide additive injection system with 50 ppm concentration monitoring"
  - node_2:
      trigger: "Thermal cycling between -40°C and 85°C"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Stress-relieved welds with post-weld heat treatment at 620°C for 1 hour"
bom_nodes:
  fuel-pump:
    type: "part"
    urn: "URN:CNFX:ME:FUEL_PUMP"
    interface_type: "physical-logic-coupled"
  fuel-level-sensor:
    type: "part"
    urn: "URN:CNFX:ME:FUEL_LEVEL_SENSOR"
    interface_type: "physical-logic-coupled"
  filler-neck:
    type: "component"
    urn: "URN:CNFX:ME:FILLER_NECK"
    interface_type: "physical-logic-coupled"
  ventilation-system:
    type: "part"
    urn: "URN:CNFX:ME:VENTILATION_SYSTEM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "CE MARKING: PRESSURE EQUIPMENT DIRECTIVE 2014/68/EU FOR PRESSURIZED FUEL TANKS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/fuel-tank.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "05650891a307ce374e470f895194e3d8dc27bb7c755dda8f39942685296a4b9e"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Fuel Tank

## 1. Technical Definition
A container designed to store fuel for internal combustion engines in vehicles and equipment.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-5.0 bar**. Failure boundary: **6.8 bar internal pressure**, Mechanism: **Yield strength of ASTM A36 steel (250 MPa) exceeded at 6.8 bar internal pressure in cylindrical tank geometry with 2:1 length:diameter ratio and 3 mm wall thickness**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Microbial contamination of diesel fuel (Cladosporium resinae growth) | 8 | Corrosion-induced pitting at fuel-water interface | Biocide additive injection system with 50 ppm concentration monitoring |
| Thermal cycling between -40°C and 85°C | 8 | Fatigue cracking at weld seams | Stress-relieved welds with post-weld heat treatment at 620°C for 1 hour |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | L | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Fuel Pump](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/fuel-pump.md) `(Standalone System)`
- [Fuel Level Sensor](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/fuel-level-sensor.md) `(Standalone System)`
- [Ventilation System](https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/ventilation-system.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Plastic Injection Molding Machine**, **Robotic Welding System**, **Leak Testing Equipment**  
**Downstream Applications**: Passenger Vehicles, Commercial Trucks, Agricultural Equipment  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the advantages of HDPE fuel tanks over steel ones?
**A**: HDPE fuel tanks are lighter, corrosion-resistant, and offer better impact resistance compared to steel tanks, making them ideal for modern vehicle designs where weight reduction and durability are priorities.

### Q: How often should fuel tank ventilation systems be inspected?
**A**: Ventilation systems should be inspected during regular vehicle maintenance, typically every 12 months or 12,000 miles, to ensure proper vapor management and prevent pressure buildup or fuel evaporation issues.

### Q: Can fuel tanks be customized for specific vehicle applications?
**A**: Yes, fuel tanks can be engineered to fit unique vehicle configurations, with custom shapes, mounting points, and integrated BOM components like pumps and sensors to meet specific OEM requirements and space constraints.

## 6. Manufacturing Compliance
- CE MARKING: PRESSURE EQUIPMENT DIRECTIVE 2014/68/EU FOR PRESSURIZED FUEL TANKS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Fuel Tank](https://cnfx.com/industry/motor-vehicle-manufacturing/product/fuel-tank)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: FUEL_TANK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 5fdeb9bb
