PORSCHE 928-110-429-09 Fuel Tank Breather Valve 924 968

( Manufacturer Part Number: 928-110-429-09 ), ( Part Type: Fuel Valve Tank Breather ), ( Oe/oem Part Number: 92811042909, 928 110 429 09 ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: No )

Review PORSCHE Genuine 968 Fuel Tank Breather Valve fits 911 944 1983–1995

The **Porsche 928-110-429-09 Fuel Tank Breather Valve** is a precision-engineered component designed exclusively for the iconic Porsche 928 models produced between 1983 and 1995, specifically tailored to the **928 S4 (968)**, **928 GTS (968)**, and earlier **928 (911/924/944-compatible variants)**. This high-performance breather valve plays a critical role in maintaining optimal fuel system pressure and ventilation within the tank, preventing vapor buildup that could lead to pressure imbalances, fuel line blockages, or even potential fuel system failures. Crafted from durable materials, including high-grade plastic and reinforced metal components, this valve ensures reliable operation under the demanding conditions of high-performance driving, where engine vacuum fluctuations and aggressive acceleration can stress the fuel system. The **928-110-429-09** is a direct OEM replacement, meticulously designed to replicate the original Porsche specifications, including precise internal spring tension and valve seating, which guarantees seamless integration with the vehicle s fuel delivery system. Whether installed in a restored classic or a meticulously maintained modern classic, this breather valve is essential for preserving the integrity of the fuel tank s ventilation, ensuring smooth engine performance, and preventing costly fuel system issues. Its compatibility extends beyond the 928 to certain **911 (964/993)**, **924**, and **944** models, making it a versatile yet specialized part for enthusiasts seeking authenticity and reliability in their Porsche s fuel management. Proper installation requires attention to detail, as it must be securely mounted to the fuel tank s vent line, allowing excess air to escape while preventing contaminants from entering the fuel system a balance critical for long-term engine health. For collectors and performance-minded drivers, this valve represents a small but vital piece of the puzzle in maintaining the purity and efficiency of Porsche s legendary engineering legacy.

### **Analysis of Buying a Porsche 928 (110-429-09) Fuel Tank Breather Valve (1983 1995 Models)**

The **Porsche 928 (110-429-09)** is a rare and highly sought-after model, particularly the **928S (110-429-09)**, which is the most desirable variant due to its performance and exclusivity. The **fuel tank breather valve** (part number **92811042909**) is a critical component for maintaining proper fuel system function, preventing vapor buildup, and ensuring engine reliability. Below is a detailed breakdown of the pros and cons of purchasing this part, along with a conclusion and recommendation.

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### **Pros of buying a Porsche 928 Fuel Tank Breather Valve (92811042909)**

1. **Prevents Fuel System Failures**

- The breather valve regulates fuel tank pressure, preventing dangerous vapor buildup that could lead to **fuel leaks, fuel pump failure, or even fire hazards**.

- A failing breather valve can cause **fuel starvation, rough idling, or complete engine stalling**, especially under acceleration or at high altitudes.

2. **Maintains Engine Performance**

- A clogged or malfunctioning breather valve disrupts the **fuel-air mixture**, leading to **poor throttle response, reduced power, and inefficient combustion**.

- Replacing it ensures **optimal fuel delivery**, which is crucial for a high-performance engine like the **3.5L (928S) or 5.0L (928S4) V8**.

3. **Extends Fuel Tank and Fuel System Lifespan**

- Without proper ventilation, **condensation and moisture buildup** can corrode the fuel tank and lines over time.

- A functional breather valve **reduces moisture accumulation**, preventing long-term damage to the fuel system.

4. **Prevents Emissions Issues**

- A failing breather valve can cause **unburned fuel vapors to escape into the atmosphere**, leading to **check engine lights (OBD-II codes)** and potential **emissions test failures** (if applicable).

- Replacing it ensures compliance with **modern emissions standards** if the car is being driven legally.

5. **Rare and Hard-to-Find Part**

- The **928 is a niche Porsche model**, and many original parts, including the breather valve, are **discontinued or no longer produced**.

- Owning the **original OEM part** (or a high-quality aftermarket equivalent) ensures **authenticity and reliability**, which is important for collectors and enthusiasts.

6. **Prevents Costly Repairs Down the Line**

- Ignoring a failing breather valve can lead to **fuel pump failure, fuel line leaks, or even a collapsed fuel tank** all of which are **expensive to repair**.

- Replacing it proactively is a **low-cost preventive measure** compared to major fuel system overhauls.

7. **Maintains Resale Value for Collectors**

- For **928 owners who plan to keep or sell their car**, ensuring all critical components (including the breather valve) are in working order **preserves value**.

- A well-maintained 928, especially a **928S (110-429-09)**, can be worth **$100,000 ** in the collector market, making proper maintenance essential.

---

### **Cons of buying a Porsche 928 Fuel Tank Breather Valve (92811042909)**

1. **High Cost (Original OEM Part)**

- The **original Porsche breather valve (92811042909)** is **expensive**, often costing **$100 $300 ** depending on availability.

- This is due to **limited production, age, and rarity** finding a genuine OEM part may require **specialty Porsche dealers or online auctions**.

2. **Aftermarket Alternatives May Not Be Perfect**

- While **aftermarket breather valves** (e.g., from **Eibach, Walbro, or other performance brands**) are cheaper (**$20 $60**), they may **not fit perfectly** or last as long as the OEM part.

- Some aftermarket valves may **not regulate pressure as precisely**, potentially leading to **minor fuel system issues** over time.

3. **Difficult Installation (For Non-Experienced Mechanics)**

- The **928 s fuel system is complex**, and the breather valve is located near the **fuel tank and filler neck**.

- **Draining fuel, disconnecting lines, and ensuring a proper seal** requires **mechanical skill** a mistake could lead to **fuel leaks or improper ventilation**.

- Some owners may need to **consult a Porsche specialist** for installation, adding to labor costs.

4. **Potential for Counterfeit or Low-Quality Parts**

- Due to the **high demand for 928 parts**, there is a risk of **counterfeit or poorly made replacements** being sold online.

- Buyers must **verify authenticity** (e.g., checking part numbers, purchasing from reputable dealers) to avoid **early failure or compatibility issues**.

5. **Not a "Quick Fix" for Other Fuel System Issues**

- If the **fuel tank itself is damaged, the fuel pump is failing, or the fuel lines are cracked**, replacing just the breather valve **won t solve the root problem**.

- A **full fuel system inspection** may be necessary, which can be **time-consuming and costly**.

6. **Environmental and Safety Concerns During Replacement**

- Working on a **fuel system requires caution** even small spills can be **flammable hazards**.

- Proper **ventilation, fuel-safe tools, and disposal methods** must be followed to avoid **accidents or environmental contamination**.

7. **Limited Lifespan of the Part (If Aftermarket)**

- While the **OEM breather valve is built to last**, some aftermarket versions may **wear out faster**, especially in **high-mileage or aggressive driving conditions**.

- Owners may need to **replace it again within a few years**, adding to long-term costs.

---

### **Conclusion**

The **Porsche 928 (110-429-09) fuel tank breather valve (92811042909)** is a **critical but often overlooked component** that plays a major role in **engine reliability, performance, and fuel system longevity**. While the **pros far outweigh the cons** for most owners particularly those who prioritize **long-term reliability and preservation of their vehicle s value** the **high cost, installation complexity, and potential for counterfeit parts** make it a **decision that requires careful consideration**.

For **serious 928 owners, collectors, or enthusiasts**, investing in the **original OEM part** (or a **high-quality aftermarket alternative**) is **highly recommended** to prevent **costly fuel system failures, maintain performance, and preserve the car s condition**. However, those on a **tight budget** may consider **aftermarket options** while ensuring they are **properly installed by a professional**.

Ultimately, **neglecting this part can lead to far greater expenses later**, so **replacing it as a preventive measure is the best approach** for anyone who values their Porsche s **reliability and legacy**.

---

### **Final Recommendation**

1. **If you own a 928 (especially a 928S 110-429-09) and suspect breather valve issues (e.g., fuel sloshing, rough idle, check engine light), replace it immediately.**

2. **Prioritize the OEM part (92811042909) if authenticity and longevity are critical.**

3. **If budget is a concern, use a reputable aftermarket valve (e.g., Walbro or Eibach) but ensure proper installation by a Porsche specialist.**

4. **Always inspect the entire fuel system (tank, lines, pump) while the car is open to avoid future problems.**

5. **Store the original breather valve (if removed) in case of future replacement needs.**

**Bottom Line:** *This is a small but essential part that, when neglected, can lead to **major engine trouble**. For the 928 owner, it s a **worthwhile investment in reliability and performance.***

Details:

Genuine Porsche 911 924 944 968 1983 1995 Fuel Tank Breather Valve. Reference Part Number: 928.110.429.09. Part Brand: Porsche.

part #: 92811042909 prices

• $119.00-$165.00

specifications fueltanksysteme:

• for models: 911, 944
• for makes: Porsche
• for years: 1983-1995
• mpn: 928-110-429-09
• part type: Fuel Valve Tank Breather
• oe/oem part number: 92811042909, 928 110 429 09
• manufacturer warranty: 1 Year
• universal fitment: No

payments fueltanksysteme:

• other
• wallet: Google-pay
• credit card: Diners-club

general fueltanksysteme:

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

returns fueltanksysteme:

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

seller fueltanksysteme:

• # reviews: 1132
• city: USA
• rating: 100.0%

offer fueltanksysteme:

• availability: In Stock
• options: Ship-to-home
• started: March 24, 2026
• quantity: 1
• sold: 0

shipping fueltanksysteme:

• service: Economy
• cost: $0.00
• transit: 2-4 Days
• type: Fixed
• class: Economy

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