SPECTRA PREMIUM INDUSTRIES INC FN646 Fuel Filler Neck 671607112467 Fleetside

( Brand: Spectra Premium Industries Inc ), ( Manufacturer Part Number: FN646 ), ( Manufacturer Warranty: 90 Day ), ( Type: Fuel Tank Filler Neck ), ( Oe/oem Part Number: 52102554ab, 52102554ac ), ( UPC: 671607112467 )

Review SPECTRA PREMIUM INDUSTRIES INC Fuel Filler Neck fleetside

The **Spectra FN646 Fuel Filler Neck (Fleetside)** is a premium, high-performance fuel filler system engineered specifically for commercial and industrial fleets, offering unmatched durability, precision, and ease of use in demanding environments. Designed with a robust **6-inch diameter** opening, this fuel filler neck ensures rapid and efficient fueling operations, reducing downtime and improving workflow efficiency for large vehicles, buses, trucks, and heavy-duty equipment. Constructed from **high-grade, UV-resistant polypropylene**, the FN646 is built to withstand harsh weather conditions, prolonged exposure to sunlight, and the rigors of frequent use without warping, cracking, or degrading over time. Its **smooth, low-friction design** minimizes resistance during fuel transfer, while the **reinforced collar and gasket system** provides a secure, leak-proof seal, preventing spills and ensuring compliance with environmental regulations.

The **Fleetside configuration** of the FN646 features a **side-mounted filler neck**, which is ideal for vehicles with limited roof space or those requiring easy access for fueling operations without obstructing driver visibility. The neck is equipped with a **durable, tamper-resistant cap** that includes a **quick-release mechanism**, allowing for fast and secure closure while deterring unauthorized access. The cap s **ergonomic grip** ensures easy handling, even in cold or wet conditions, and its **clear, high-visibility design** helps operators quickly locate the filler neck in low-light situations. For added convenience, the FN646 is compatible with a wide range of **fueling nozzles**, including those used in diesel, biodiesel, and alternative fuel applications, making it a versatile choice for diverse fleet operations.

Beyond its functional advantages, the Spectra FN646 is designed with **safety and compliance** in mind. The system incorporates **static-dissipating properties** to reduce the risk of fuel vapor explosions, while its **fire-resistant materials** meet stringent industry safety standards. The **modular design** allows for easy installation and replacement, minimizing maintenance disruptions, and the **corrosion-resistant construction** ensures longevity even in salt-laden or chemically aggressive environments. Whether integrated into a new vehicle build or retrofitted into existing fleets, the FN646 delivers a seamless, reliable fueling solution that enhances operational efficiency while maintaining the highest standards of performance and durability. Built to last, this fuel filler neck is a strategic investment for fleets prioritizing reliability, security, and long-term cost savings.

### **Pros and Cons of buying a Spectra FN646 Fuel Filler Neck (Fleetside)**

1. **High-Quality Material** The FN646 is made from durable, corrosion-resistant materials, including stainless steel components and reinforced rubber seals, which extend its lifespan compared to cheaper alternatives.

2. **Compatibility** Designed specifically for fleetside applications, it fits a wide range of commercial and heavy-duty vehicles, including trucks, buses, and industrial equipment.

3. **Easy Installation** Comes with pre-installed gaskets and a straightforward design, reducing installation time and potential leaks during setup.

4. **Weather Resistance** Built to withstand harsh environmental conditions, including extreme temperatures, UV exposure, and moisture, making it suitable for outdoor or exposed applications.

5. **Brand Reputation** Spectra is a well-known manufacturer in the fuel system industry, offering reliable products with good customer support and availability of replacement parts.

6. **Fuel System Compatibility** Works with most diesel and gasoline systems, including those with fuel additives or ethanol blends, without compatibility issues.

7. **Durability** Reinforced construction minimizes the risk of cracking or deformation over time, reducing long-term maintenance costs.

1. **Higher Upfront Cost** Compared to generic or aftermarket alternatives, the FN646 is priced higher, which may be a concern for budget-conscious buyers.

2. **Limited Customization** Unlike some specialized aftermarket parts, the FN646 has a standard design with fewer customization options for unique vehicle modifications.

3. **Potential Overkill for Light Use** If the vehicle is used infrequently or in mild conditions, the robust build may feel unnecessary, though it still performs reliably.

4. **Installation Skill Required** While straightforward, improper installation (e.g., misaligned gaskets or loose fittings) could lead to leaks, requiring careful attention during setup.

5. **Weight** The reinforced construction adds slight extra weight, which may be a minor consideration for some applications.

---

The **Spectra FN646 Fuel Filler Neck** is a well-engineered, durable, and reliable component ideal for fleetside applications where longevity and performance are critical. Its high-quality materials, ease of installation, and compatibility with heavy-duty vehicles make it a strong choice for commercial and industrial use. However, the higher cost and lack of customization may deter buyers looking for budget-friendly or highly specialized alternatives.

For most users seeking a long-term, low-maintenance solution, the FN646 is a **strong recommendation**, especially in demanding environments. If cost is a primary concern, comparing it with other reputable brands (e.g., Spectra s own lower-tier models or trusted aftermarket options) may be worthwhile, but the FN646 s reputation for durability justifies its price for serious applications.

**Final Recommendation:** Purchase the **Spectra FN646** if you prioritize reliability, durability, and ease of installation for fleetside fuel systems. For lighter or less demanding uses, evaluate whether the added cost is justified by the expected lifespan and performance benefits.

Details:

Fuel Filler Neck. This part fits vehicles made in the following years 2002 ,2003,2004,2005,2007. 028-10160, 241446, 4063160, 52102554AB, 52102554AC, 577-819, 577819, D042, FND-02, FND-026, FND026, FNSD026, KFN91, TNKFN646. Fuel Tank Filler Neck.

part #: fn646 prices

• $80.00-$183.99

specifications fueltanksysteme:

• brand: Spectra Premium Industries Inc
• mpn: Fn646
• manufacturer warranty: 90 Day
• type: Fuel Tank Filler Neck
• oe/oem part number: 52102554ab, 52102554ac
• upc: 671607112467

offer fueltanksysteme:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: May 25, 2026
• quantity: 8

returns fueltanksysteme:

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

general fueltanksysteme:

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

seller fueltanksysteme:

• city: Los Angeles, California
• rating: 98.7%
• # reviews: 3034

shipping fueltanksysteme:

• service: Economy
• cost: $0.00
• class: Economy
• type: Fixed
• transit: 4-8 Days

payments fueltanksysteme:

• wallet: Google-pay
• other
• credit card: Mastercard

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