HYUNDAI 31100-BY000-100-500 Hybrid Fuel Gas Tank Reservoir 31100-BY000/100/500 1.6L

( Manufacturer Part Number: 31100-BY000/100/500 ), ( Type: Fuel Tank ), ( Placement On Vehicle: Rear ), ( Fuel Type: Gasoline )

Review HYUNDAI 31100-by000/100/500 Hybrid 1.6l Fuel Gas Tank Reservoir Oem fits ELANTRA 500 2021–2025

The **Hyundai 31100-BY000/100/500 2021 2025 Elantra Hybrid 1.6L Fuel Gas Tank Reservoir** is a precision-engineered component designed to meet the stringent performance and efficiency demands of Hyundai s advanced hybrid powertrain system. This high-quality fuel tank reservoir is specifically tailored for the **2021 through 2025 model years** of the **Elantra Hybrid**, ensuring seamless compatibility with the vehicle s **1.6L gasoline-electric hybrid drivetrain**. Crafted from durable, corrosion-resistant materials, this reservoir is engineered to maintain optimal fuel pressure and flow, supporting the hybrid system s efficient blending of gasoline and electric power. Its robust construction minimizes the risk of leaks, ensuring reliability even under varying driving conditions, from city commutes to highway travel. The reservoir s design also incorporates precise calibration to work harmoniously with the hybrid s **gasoline direct injection (GDI) system**, helping to optimize fuel delivery and enhance overall engine performance. Whether installed during routine maintenance or as part of a hybrid-specific service, this reservoir is a critical component that contributes to the longevity and efficiency of the Elantra Hybrid s hybrid powertrain, delivering both performance and dependability for drivers seeking a blend of fuel economy and power.

### **Pros and Cons of Buying a 2021 2025 Hyundai Elantra Hybrid (1.6L) with a Modified Fuel Gas Tank Reservoir**

#### **Pros**

1. **Fuel Efficiency and Cost Savings**

- The Elantra Hybrid s 1.6L engine paired with an electric motor delivers excellent MPG (around 50 54 city/46 50 highway), reducing reliance on gasoline.

- If the fuel gas tank reservoir modification allows for alternative fuel (e.g., CNG, LPG, or biogas), it could further lower operating costs, especially in regions with high gasoline prices.

2. **Hybrid Reliability and Low Emissions**

- Hyundai s hybrid systems are generally robust, with fewer moving parts than traditional engines, leading to lower maintenance costs.

- The hybrid powertrain meets strict emissions standards, making it suitable for areas with strict environmental regulations.

3. **Hybrid Warranty Coverage**

- Hyundai offers an extended hybrid battery warranty (typically 10 years/100,000 miles), providing long-term peace of mind.

- The powertrain warranty (5 years/60,000 miles) covers hybrid components, reducing repair risks.

4. **Modification Potential for Alternative Fuels**

- If the fuel gas tank reservoir modification is for a cleaner or cheaper fuel source (e.g., compressed natural gas, biogas, or propane), it could align with sustainability goals or budget constraints.

- Some alternative fuels (like CNG) can extend engine life by reducing carbon buildup.

5. **Compact and Practical Design**

- The Elantra Hybrid is a hatchback with decent cargo space (15.9 cu. ft. behind rear seats, expandable to 54.7 cu. ft. with seats folded), making it versatile for daily use.

- The hybrid powertrain provides smooth acceleration without sacrificing fuel economy.

6. **Resale Value and Brand Reputation**

- Hyundai maintains strong resale value for its hybrids, and the brand is known for customer service and warranty support.

- The Elantra is a popular choice, ensuring a ready market if you decide to sell later.

---

#### **Cons**

1. **Modified Fuel System Risks**

- **Compatibility Issues:** Retrofitting a fuel gas tank reservoir (e.g., for CNG/LPG) may not be officially supported by Hyundai, potentially voiding warranties or causing drivability problems.

- **Engine Modifications:** Some alternative fuels require engine tuning or additional components (e.g., fuel injectors, pressure regulators), which could lead to reliability concerns if not installed correctly.

- **Safety Hazards:** Gas modifications (especially CNG) involve high-pressure tanks and specialized fittings. Poor installation can pose fire or explosion risks.

2. **Potential Performance Trade-offs**

- If the modification reduces the fuel tank s capacity or alters fuel delivery, it might slightly impact range or acceleration.

- Some alternative fuels (e.g., LPG) have lower energy density than gasoline, potentially requiring more frequent refueling.

3. **Maintenance and Service Challenges**

- Finding a mechanic experienced with hybrid alternative fuel systems could be difficult, increasing repair costs.

- Hyundai dealerships may refuse to service the vehicle if modifications are deemed non-compliant.

4. **Cost of Modification**

- Installing a fuel gas tank reservoir (e.g., for CNG) can cost **$3,000 $6,000 **, depending on the fuel type and labor.

- Conversion kit (if not DIY).

- Engine tuning or ECU reprogramming.

- Safety inspections or certifications.

5. **Insurance and Registration Concerns**

- Some insurers may classify the vehicle as a "modified" or "special fuel" car, leading to higher premiums.

- Local regulations may require additional permits or inspections for alternative fuel vehicles.

6. **Hybrid-Specific Limitations**

- Hybrid batteries degrade over time (though warranties cover most failures). Replacement costs can be **$2,000 $4,000**.

- Cold weather can reduce electric-only range, though the Elantra Hybrid handles this better than some competitors.

7. **Depreciation and Marketability**

- A modified hybrid may depreciate faster than a stock model, as buyers often prefer factory-certified vehicles.

- Financing a modified vehicle could be harder, as lenders may view it as higher risk.

---

### **Conclusion**

- You prioritize **fuel efficiency** and are open to **alternative fuels** (e.g., CNG, LPG) for cost savings.

- You re willing to **assume the risks and costs** of a non-OEM modification.

- You have access to **reliable mechanics** experienced in hybrid alternative fuel systems.

- You re prepared for **potential warranty voids** and **higher maintenance costs**.

However, if you prefer **simplicity, warranty protection, and lower long-term risks**, sticking with the **stock hybrid configuration** is likely the safer choice. The Elantra Hybrid already offers strong fuel economy, so unless you have a specific need for alternative fuels, the modification may not be worth the hassle.

### **Recommendation**

- Research **certified conversion kits** (e.g., for CNG) and work with a **specialized shop** to ensure proper installation.

- Verify **local laws** regarding alternative fuel vehicles and insurance requirements.

- Budget for **higher maintenance costs** and potential **reduced resale value**.

- Purchase the **stock Elantra Hybrid** and enjoy its **proven reliability, warranty coverage, and fuel efficiency** without modification risks.

- Consider **regular gasoline savings** through Hyundai s **Hybrid Assist** or **regenerative braking** features.

Ultimately, the decision depends on your **budget, technical comfort with modifications, and long-term goals** for the vehicle. If the modification aligns with your needs and is executed carefully, it could be a worthwhile investment. Otherwise, the stock hybrid remains a **low-risk, high-reward** choice.

Details:

1.6L GRI I4 GAS/ELECTRIC HYBRID ENGINE. 89,284 MILES. PARTS CAME OFF A 2023 HYUNDAI ELANTRA HYBRID LIMITED DCT FWD. 6-SPEED DUAL CLUTCH AUTOMATIC TRANSMISSION.

part #: 31100by000100500 prices

• $199.99-$433.00

specifications fueltanksysteme:

• for models: 500, Elantra
• for makes: Hyundai
• for years: 2021-2025
• mpn: 31100-by000/100/500
• type: Fuel Tank
• placement on vehicle: Rear
• fuel type: Gasoline

seller fueltanksysteme:

• city: Anderson, South Carolina
• rating: 99.9%
• # reviews: 17440

offer fueltanksysteme:

• sold: 0
• quantity: 1
• options: Ship-to-home
• started: May 18, 2026
• availability: In Stock

shipping fueltanksysteme:

• type: Fixed
• class: Freight
• cost: $200.00
• service: Flat Rate Freight

general fueltanksysteme:

• condition: Used
• Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks

returns fueltanksysteme:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

payments fueltanksysteme:

• credit card: Mastercard
• wallet: Paypal
• other

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