GATES SX-6600 Fuel Tank Gas Cap Sunburst Ag 1.5L L4

( Brand: Gates ), ( Manufacturer Part Number: SX-6600 ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Width: 3.630 ), ( Item Height: 3.000 ), ( Manufacturer Warranty: Recommended Service Interval ), ( Ipn: C239 32-16 ), ( Compatible Model: Sunburst ), ( Compatible Year: 1988 1987 1986 1985 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Gates Fuel Tank Cap )

Review GATES Fuel Tank Cap Pontiac Sunburst 1.5l L4 Gas Delivery Ag fits 1985–1988

The **Gates SX-6600 Fuel Tank Cap** is a meticulously engineered, high-performance replacement part designed specifically for the **1985 1988 Pontiac Sunbird** equipped with the **1.5L L4 gasoline engine**, ensuring a precise fit and optimal functionality for your vehicle s fuel system. Crafted from durable, corrosion-resistant materials, this fuel cap is built to withstand the rigors of daily driving while maintaining a sleek, factory-inspired appearance that complements the **Sunburst** s classic styling. The cap features a **secure, tamper-resistant locking mechanism**, preventing accidental dislodging and ensuring a tight seal to minimize fuel vapor emissions, which not only enhances performance but also contributes to environmental compliance. Its **smooth, contoured design** aligns seamlessly with the original equipment manufacturer (OEM) specifications, providing both an aesthetic match and reliable functionality. The **high-quality rubber gasket** within the cap guarantees a leak-proof fit, protecting against fuel spills and maintaining proper pressure within the fuel system, which is critical for engine efficiency and longevity. Whether you re restoring a vintage Sunbird or simply upgrading a worn-out component, the Gates SX-6600 delivers the perfect blend of **durability, precision, and authenticity**, ensuring your vehicle operates at its best while preserving its classic charm.

### Pros and Cons of Buying a Gates SX-6600 Fuel Tank Cap for a 1985-1988 Pontiac Sunbird 1.5L L4 Gas Engine

The Gates SX-6600 fuel tank cap is a well-regarded aftermarket replacement part, particularly for older vehicles like the 1985-1988 Pontiac Sunbird with a 1.5L inline-four engine. Here are the key advantages:

1. **Improved Fuel Economy** The SX-6600 is designed with a pressure relief valve that allows excess fuel vapor to escape when the tank is full, reducing evaporative emissions and improving fuel efficiency. This is particularly beneficial for older cars that may have had stock caps that were less efficient.

2. **Better Emissions Compliance** The cap features a one-way valve system that helps meet or exceed federal emissions standards, which can be important for vehicles that may have been modified or are driven in areas with stricter regulations.

3. **Durability and Quality** Gates is a reputable manufacturer known for producing high-quality automotive parts. The SX-6600 is made from durable materials and is designed to withstand repeated use without leaking or failing prematurely.

4. **Easy Installation** The cap is designed to fit standard fuel tank openings, and installation typically requires only basic tools. It comes with a gasket to ensure a proper seal, reducing the risk of leaks.

5. **Compatibility with Aftermarket Modifications** If your Sunbird has been modified (e.g., with a turbocharger, performance fuel injectors, or a larger fuel tank), the SX-6600 s pressure relief system can help manage fuel vapor more effectively than a stock cap.

6. **Cost-Effective Upgrade** Compared to some high-end aftermarket caps, the SX-6600 is reasonably priced while still offering significant performance and emissions benefits.

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1. **Potential Over-Pressurization Risk** Some drivers report that the cap s pressure relief valve can allow fuel vapors to escape too aggressively, particularly in hot climates or when the tank is frequently refueled. This could lead to a slight loss of fuel efficiency in certain driving conditions.

2. **Not a Universal Fit** Although the SX-6600 is designed for many late-model vehicles, it may not be an exact match for every 1985-1988 Pontiac Sunbird, especially if the stock cap had unique threading or a non-standard design. Always verify compatibility with your specific model year and engine configuration.

3. **Possible Resistance from Some Mechanics** Older mechanics or those unfamiliar with aftermarket emissions upgrades might dismiss the cap as unnecessary or even counterproductive, particularly if they believe the stock cap was adequate for the vehicle s original specifications.

4. **Limited Brand Support** While Gates is a well-known brand, some users have reported occasional issues with the valve mechanism failing over time, though this is relatively rare. If the cap fails, replacement parts may not be as readily available as OEM components.

5. **Potential for Improper Sealing** If the gasket is not installed correctly or if the fuel tank opening is damaged, the cap may not seal properly, leading to leaks or evaporative emissions issues. This risk is mitigated by ensuring a clean installation.

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The Gates SX-6600 fuel tank cap is a strong upgrade for a 1985-1988 Pontiac Sunbird 1.5L L4 engine, offering clear benefits in fuel efficiency, emissions compliance, and durability. While there are minor drawbacks such as the potential for over-pressurization or compatibility concerns these are outweighed by the cap s performance advantages for most drivers.

For owners looking to improve their vehicle s fuel economy, reduce emissions, and ensure a reliable seal, the SX-6600 is a highly recommended choice. However, if you are unsure about compatibility or installation, consulting with a trusted mechanic or performing a thorough fitment check beforehand is advisable.

**Buy the Gates SX-6600 fuel tank cap.** It is a cost-effective, high-quality upgrade that will likely enhance your Sunbird s performance and emissions compliance without significant drawbacks. Ensure you verify the part number and fitment for your exact model year before purchasing, and follow installation instructions carefully to avoid issues. If you experience any problems, Gates offers customer support, and the part is widely available from reputable automotive suppliers.

Details:

Gates Fuel Tank Cap for 1985 - 1988 Pontiac Sunburst 1.5L L4 Gas Delivery ag: Status: In Stock.

part #: sx6600 prices

• $15.77-$32.24

specifications fueltanksysteme:

• for makes: Pontiac
• for years: 1985-1988
• brand: Gates
• mpn: Sx-6600
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item width: 3.630
• item height: 3.000
• manufacturer warranty: Recommended Service Interval
• ipn: C239 32-16
• compatible model: Sunburst
• compatible year: 1988 1987 1986 1985
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Gates Fuel Tank Cap

offer fueltanksysteme:

• sold: 0
• started: April 10, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 10

returns fueltanksysteme:

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

payments fueltanksysteme:

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

seller fueltanksysteme:

• city: Indianapolis, Indiana
• # reviews: 643390
• rating: 99.6%

general fueltanksysteme:

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

shipping fueltanksysteme:

• class: Standard, Expedited
• cost: $0.00
• transit: 3-6 Days
• service: Standard, Expedited
• type: Fixed

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