GM 474793 Gas Tank Vapor Tee

( Brand: Gm ), ( Manufacturer Part Number: 474793 ), ( Part Type: Tank Tee ), ( Country Of Origin: United States )

Review GM Gas Tank Factory Stock Vapor Tee Item fits CORVETTE 1984–1996

The **GM 474793 Gas Tank Vapor Tee** is a meticulously engineered component designed specifically for the **1984 1996 Chevrolet Corvette** models, serving as a critical link in the vehicle s evaporative emissions control system (EVAP). This high-quality, direct-fit part is crafted to maintain the integrity of the Corvette s fuel system by channeling vapor from the fuel tank to the engine s intake manifold, where it is safely combusted rather than released into the atmosphere. The **474793 vapor tee** is constructed from durable, corrosion-resistant materials, ensuring long-term reliability even under the demanding conditions of high-performance driving. Its precise design aligns with the OEM specifications of the original equipment manufacturer, guaranteeing a seamless fit with the Corvette s fuel tank, charcoal canister, and purge valve assembly. Whether installed in a classic show car, a restored daily driver, or a high-mileage vehicle, this component plays a vital role in reducing harmful emissions while preserving the engine s efficiency. For enthusiasts seeking authenticity and performance, this vapor tee is an essential replacement part that upholds the integrity of the Corvette s fuel system, ensuring compliance with emissions regulations and maintaining optimal engine function.

The GM part number **474793** refers to a **vapor tee** used in the **1984 1996 Corvette s fuel system**, specifically for the **vapor recovery system** (EVAP) on models with **fuel-injected engines (L98, LT1, LT4)**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a GM 474793 Vapor Tee**

1. **Direct OEM Fitment**

- This part is a **direct replacement** for the factory vapor tee on 1984 1996 Corvettes, ensuring compatibility without modifications. It fits the EVAP system s tubing connections and mounting points without issues.

2. **Prevents EVAP System Failures**

- The vapor tee helps regulate **fuel vapor pressure** in the EVAP canister, preventing clogs, leaks, or sensor malfunctions. A failing vapor tee can trigger **Check Engine Lights (CEL)** due to improper vapor flow, leading to potential **smog test failures** or drivability issues.

3. **Common and Widely Available**

- As a **high-demand OEM part**, it is easy to find at **automotive salvage yards, online marketplaces (eBay, RockAuto, Corvette specialty shops), or GM dealers**. This reduces the risk of long wait times or difficulty sourcing.

4. **Cost-Effective for a Critical Component**

- While not the cheapest part, it is **far less expensive** than replacing the entire EVAP system or dealing with secondary damage (e.g., fuel pump failure from vapor pressure issues). Prices typically range from **$20 $60**, depending on condition and source.

5. **Prevents Long-Term Damage**

- A failing vapor tee can cause **excessive vapor buildup**, leading to **fuel system contamination** or **engine performance issues** over time. Replacing it early avoids more costly repairs.

6. **Easy Installation**

- The part is **relatively simple to install**, requiring basic tools (sockets, line wrench, possibly a new EVAP hose if cracked). Most mechanics or experienced DIYers can complete the job in **under an hour**.

7. **Supports Emissions Compliance**

- The EVAP system is crucial for **passing emissions tests** in many states. A faulty vapor tee can cause the car to fail, making this a **practical upgrade** for owners who drive in regulated areas.

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### **Cons of buying a GM 474793 Vapor Tee**

1. **Potential for Counterfeit or Damaged Parts**

- Since this is a **common part**, there is a risk of purchasing a **salvage-yard part with hidden damage** (e.g., cracked housing, corroded threads, or internal blockages). Always inspect for:

- **Cracks or corrosion** in the plastic or metal housing.

- **Clean internal passages** (no debris or clogs).

- **Intact O-rings or gaskets** (may need replacement).

- Buying from **reputable sellers** (e.g., Corvette specialty shops, verified eBay sellers) reduces this risk.

2. **Age-Related Wear in Salvage Parts**

- If sourced from a **junkyard**, the part may have **internal corrosion** or **degraded rubber seals**, leading to leaks or poor function. Newer or **reconditioned parts** (if available) are preferable.

3. **May Require Additional EVAP System Checks**

- Replacing just the vapor tee does not guarantee the **entire EVAP system is healthy**. Other components (e.g., **EVAP canister, purge valve, hoses, or sensors**) may also need inspection or replacement, adding to labor costs.

4. **Limited Longevity in Harsh Conditions**

- If the car is driven in **extreme heat, cold, or corrosive environments**, the plastic housing or rubber seals may degrade faster, requiring **frequent replacements**. This is more of a **maintenance consideration** than a flaw in the part itself.

5. **DIY Installation Challenges**

- **Properly seating the O-rings** (if included).

- **Ensuring a tight but not stripped connection** on the tubing fittings.

- Professional installation ( $50 $100 labor) may be worth it for inexperienced owners.

6. **Not a "Performance" Part**

- Unlike some aftermarket upgrades, this is a **maintenance/repair part**, not a performance-enhancing component. Owners looking for **tuning benefits** will not see any gains from replacing it.

7. **Potential for Aftermarket Alternatives**

- Some aftermarket vapor tees (e.g., **Meguiar s, ACDelco, or specialty EVAP parts**) may offer **better materials or warranties**, but they can be **more expensive** and may not fit as snugly as the OEM part.

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### **Conclusion**

The **GM 474793 vapor tee** is a **practical and necessary replacement** for 1984 1996 Corvette owners experiencing **EVAP-related issues** (e.g., CEL codes P0440, P0455, or rough idle). Its **direct fitment, affordability, and critical role in emissions compliance** make it a **smart investment** for preventing larger fuel system problems.

However, **quality and condition vary**, so buyers should **inspect the part thoroughly** or purchase from trusted sources. Additionally, **checking the rest of the EVAP system** (canister, hoses, sensors) during installation ensures long-term reliability.

For most owners, **replacing the vapor tee is a straightforward and cost-effective fix** that avoids more expensive repairs down the line. Those uncomfortable with EVAP system work may opt for **professional installation** to ensure proper function.

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### **Final Recommendation**

You re experiencing **EVAP-related symptoms** (CEL codes, rough idle, or smog test failures).

You want a **direct OEM replacement** that is **easy to install** and **widely available**.

You plan to **inspect or replace other EVAP components** (canister, hoses) at the same time.

You source it from a **reputable seller** (e.g., Corvette specialty shop, verified eBay listing) to avoid counterfeit or damaged parts.

You re unsure about **EVAP system diagnostics** and may need to replace multiple parts.

The part is **cracked, corroded, or clogged** upon inspection (do not install).

You re looking for a **performance upgrade** (this part does not improve power or handling).

- **Test for leaks** after installation by checking for **fuel odors** or **hissing sounds**.

- **Clear the CEL** and **drive the car** to confirm the issue is resolved.

- **Consider a new EVAP hose** if the old one is brittle or cracked.

- **Document the part number** for future reference in case of warranty or replacement needs.

**Verdict:** **Worth the purchase** for most Corvette owners dealing with EVAP issues, provided the part is **new or in good condition**. It s a **small but critical component** that prevents bigger problems.

Details:

NCRS member since 1983.bottle 031626.GM ORIGINAL.GM REFERENCE NUMBER 474893. 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 Corvette gas tank brass factory stock vapor tee item, original GM, used.

part #: 474793 prices

• $23.99-$28.99

specifications fueltanksysteme:

• for models: Corvette
• for years: 1984-1996
• brand: Gm
• mpn: 474793
• part type: Tank Tee
• country of origin: United States

offer fueltanksysteme:

• quantity: 1
• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: March 16, 2026

general fueltanksysteme:

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

seller fueltanksysteme:

• rating: 99.9%
• # reviews: 25769
• city: Stuart, Florida

shipping fueltanksysteme:

• cost: $8.75
• type: Calculated
• class: Standard
• transit: 3-8 Days
• carrier: USPS
• service: USPS Ground Advantage

returns fueltanksysteme:

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

payments fueltanksysteme:

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

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