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OE Quality
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Spectra FN645 Fuel Tank Filler Neck
Spectra FN645 Fuel Tank Filler Neck
The Spectra FN645 fuel tank filler neck is an OE-style replacement for select Dodge Ram heavy-duty trucks. It is built for direct fitment on listed applications and supports reliable fuel filling on 1998-1999 Dodge Ram 2500 and Dodge Ram 3500 models.
Key Features
- Fuel tank filler neck for air and fuel delivery service
- OE replacement for select Dodge Ram 2500 and Ram 3500 applications
- Engineered with manufacturing controls to meet or exceed original equipment performance
- Cross-references Spectra Premium FN645 with TNKFN645 for the same application
- Part number FN645 for catalog and service lookup
Detailed Description
Use the Spectra FN645 when replacing a damaged, corroded, or leaking filler neck on compatible Dodge Ram trucks. This part is listed for 1998-1999 Dodge Ram 2500 and 1998-1999 Dodge Ram 3500 applications, including 1998 models built from January 12, 1998 and select dual rear wheel configurations. The FN645 is designed as a direct replacement fuel tank filler neck for service work where the original neck no longer seals or routes fuel properly.
Spectra applies engineering and quality control processes to help the replacement part match original equipment performance expectations. For buyers searching for a Dodge Ram 2500 fuel filler neck, Dodge Ram 3500 fuel filler neck, or Spectra FN645 replacement, this part provides a cataloged solution for the listed trucks.
What It Helps Fix
- Fuel leakage at the filler neck
- Corrosion or rust damage on the original neck
- Cracked or bent filler tube assembly
- Fueling difficulty caused by a restricted or damaged neck
- Failed OE filler neck on listed Dodge Ram trucks
Installation Notes and Tips
Verify year, model, build date, and dual rear wheel configuration before ordering. Match the existing routing and connection points to the vehicle’s original filler neck during installation. Confirm fitment for 1998 Dodge Ram 2500 and 1998 Dodge Ram 3500 models built from January 12, 1998, as well as the listed 1999 applications. Part number FN645 should be checked against the vehicle’s original reference before service begins.
Quality Assurance
Spectra Premium states that its fuel filler necks are engineered, manufactured, and quality-controlled to meet or exceed the performance of the original equipment they replace.
This part fits 10 vehicles. Search below:
| Year | Make | Model | Body Type | Bed Length | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 1999 | Dodge | Ram 2500 | Extended Cab Pickup | 5.9L | L6 | N/A | w/ Dual Rear Wheels (DRW) | |
| 1999 | Dodge | Ram 2500 | Cab & Chassis | 5.9L | L6 | N/A | ||
| 1999 | Dodge | Ram 3500 | Extended Cab Pickup | 5.9L | L6 | N/A | w/ Dual Rear Wheels (DRW) | |
| 1999 | Dodge | Ram 3500 | Cab & Chassis | 5.9L | L6 | N/A | ||
| 1999 | Dodge | Ram 3500 | Standard Cab Pickup | 8' 0" Foot Bed | 5.9L | L6 | N/A | |
| 1998 | Dodge | Ram 2500 | Extended Cab Pickup | 5.9L | L6 | N/A | w/ Dual Rear Wheels (DRW) | |
| 1998 | Dodge | Ram 2500 | Cab & Chassis | 5.9L | L6 | N/A | From Jan/12/1998 | |
| 1998 | Dodge | Ram 3500 | Extended Cab Pickup | 5.9L | L6 | N/A | w/ Dual Rear Wheels (DRW) | |
| 1998 | Dodge | Ram 3500 | Cab & Chassis | 5.9L | L6 | N/A | ||
| 1998 | Dodge | Ram 3500 | Standard Cab Pickup | 8' 0" Foot Bed | 5.9L | L6 | N/A | From Jan/12/1998 |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.