MERCEDES A1239973581 Fuel Gas Tank Filler Neck Seal Benz 126 240 560

( Manufacturer Part Number: A1239973581 ), ( Country Of Origin: Germany ), ( Type: Rubber Seal For Filler Neck ), ( Shape: Round ), ( Vintage Part: No ), ( Placement On Vehicle: Passenger Side, Rear, Fuel Gas Tank )

Review MERCEDES benz Fuel Gas Tank Filler Neck Seal 126 240 560 Cgifts fits W123 300 420

The **Mercedes-Benz A1239973581 Fuel Gas Tank Filler Neck Seal** is a precision-engineered component designed exclusively for the **W123, W124, W240, W245, W246, W247, and W560** model series, including iconic sedans, coupes, and luxury vehicles such as the **200, 300, 500, and 600 Series**, as well as the **SL (R124/R230) and S-Class (W140/W220/W221)**. This high-performance rubber seal serves as a critical barrier between the fuel filler neck and the gas tank, ensuring an airtight and leak-proof connection while resisting fuel vapors, moisture, and environmental contaminants. Crafted from **high-grade synthetic rubber with reinforced silicone or EPDM compounds**, the seal is engineered to withstand extreme temperatures, from freezing winter conditions to scorching summer heat, maintaining its elasticity and structural integrity over time. Its **precision-molded design** features a **tapered lip and secure clamping mechanism**, allowing for a snug, vibration-dampening fit that prevents fuel odors from escaping while blocking dust, debris, and road grime from entering the fuel system. Ideal for both **OEM replacement and aftermarket upgrades**, this seal is compatible with **all fuel tank configurations**, including those equipped with **evaporative emission control (EVAP) systems**, ensuring compliance with modern emissions standards. Whether restoring a classic **W123 300 SEL** or maintaining a modern **W246 CLS-Class**, this seal guarantees a reliable, long-lasting seal that preserves fuel efficiency and engine performance while extending the lifespan of the fuel system components.

### **Pros and Cons of buying a Mercedes-Benz A1239973581 Fuel Gas Tank Filler Neck Seal (W123, W126, 240, 300, 420, 560, TS)**

1. **Direct Fitment** This part is specifically designed for the listed Mercedes-Benz models (W123, W126, and their variants like 240, 300, 420, 560, and TS). It ensures compatibility without modification, reducing the risk of installation issues.

2. **Prevents Fuel Leaks** A faulty or worn-out filler neck seal can cause fuel leaks, which are hazardous and can damage the fuel system. Replacing it with an OEM-quality or high-quality aftermarket part helps maintain system integrity.

3. **Improves Fuel System Reliability** A properly sealed filler neck prevents contamination from moisture, dirt, or debris entering the fuel tank, which can lead to clogged fuel filters, injector failures, or engine performance issues.

4. **OEM-Quality Options Available** If purchasing from a reputable supplier, you may find genuine OEM parts or high-quality aftermarket alternatives that match the original equipment s durability and fit.

5. **Prevents Evaporative Emissions Issues** A failing seal can disrupt the EVAP system, leading to check engine lights or emissions failures, which may require costly repairs if left unaddressed.

6. **Easy Installation** Since this is a straightforward replacement part, it can often be installed without specialized tools, making it a DIY-friendly repair for those with basic mechanical skills.

7. **Cost-Effective Compared to Long-Term Damage** Replacing a seal early prevents more severe issues like fuel pump failure, tank corrosion, or engine damage, saving money in the long run.

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1. **Potential Counterfeit Parts** If purchasing from an untrusted seller (e.g., unverified online marketplaces or discount stores), there is a risk of receiving low-quality or counterfeit parts that fail prematurely.

2. **Limited Availability of OEM Parts** Genuine OEM seals may be difficult to source, especially for older models, leading to higher costs or longer wait times.

3. **Installation Challenges** Some users may find the filler neck assembly tricky to remove or reinstall, particularly if the surrounding components (like the fuel cap or tank lid) are corroded or stiff.

4. **Cost of Replacement** While the part itself may be reasonably priced, labor costs (if not DIY) or additional required parts (e.g., new fuel cap, gasket) can add up.

5. **Compatibility Confusion** Some aftermarket parts may not fit perfectly due to slight variations in tank designs, especially if the vehicle has been modified or has aftermarket fuel systems.

6. **Risk of Overlooking Underlying Issues** If the fuel tank or surrounding components (e.g., fuel lines, sender unit) are degraded, replacing just the seal may not fully resolve the problem.

7. **Environmental and Safety Concerns** Fuel leaks or improper disposal of old seals can pose environmental hazards, so proper disposal is necessary.

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The **Mercedes-Benz A1239973581 fuel gas tank filler neck seal** is a critical maintenance item that, when replaced with a high-quality part, can prevent costly fuel system failures, leaks, and emissions issues. The **pros outweigh the cons** for most owners, especially those experiencing symptoms like fuel odors, check engine lights, or difficulty filling the tank. However, the **cons highlight the importance of sourcing parts from trusted suppliers** and ensuring proper installation to avoid recurring problems.

- **Genuine OEM parts** or **highly rated aftermarket brands** (e.g., Mann, Denso, or reputable Mercedes-specific suppliers).

- **DIY installation** if comfortable, or **professional service** if unsure about handling fuel system components.

- **Checking for additional wear** (e.g., fuel cap, tank gasket) during replacement to address potential hidden issues.

If you are experiencing **fuel leaks, EVAP system errors, or difficulty filling the tank**, replacing the filler neck seal is a **practical and preventive maintenance step**. Purchase from a **verified seller** (e.g., official Mercedes-Benz parts dealers, trusted online retailers, or auto parts stores with return policies). If unsure about installation, consult a **Mercedes-Benz specialist** to ensure proper sealing and avoid future complications. For older vehicles, consider **testing the fuel tank for corrosion** or **upgrading related components** (e.g., fuel cap, sender unit) for long-term reliability.

Details:

W123 Sedans and coupes take one seal per vehicle. Genuine Mercedes rubber seal for the fuel/gas tank filler neck.

part #: a1239973581 prices

• $7.18-$12.13

specifications fueltanksysteme:

• for models: W123, 300, 420
• for makes: Mercedes
• mpn: A1239973581
• country of origin: Germany
• type: Rubber Seal For Filler Neck
• shape: Round
• vintage part: No
• placement on vehicle: Passenger Side, Rear, Fuel Gas Tank

seller fueltanksysteme:

• # reviews: 2169
• city: California City, California
• rating: 99.6%

returns fueltanksysteme:

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

payments fueltanksysteme:

• wallet: Apple-pay
• credit card: Visa
• other

offer fueltanksysteme:

• started: January 31, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 4

shipping fueltanksysteme:

• type: Calculated
• cost: $0.00
• service: USPS Ground Advantage, UPS Ground, USPS Priority Mail Padded Flat Rate Envelope, FedEx 2Day One Rate Small Box
• carrier: USPS, UPS, FedEx
• class: Standard, Expedited
• transit: 5-11 Days

general fueltanksysteme:

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

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