1. Introduction
The NAPA Gold Fuel Filter 3406 is a high-quality replacement part designed to protect your engine by effectively filtering fuel. This spin-on fuel/water separator filter is engineered to provide excellent engine protection under various driving conditions, including severe environments like dirt roads, construction sites, and stop-and-go traffic. It is specifically designed for use with Caterpillar Engines and Cummins Celect Engines.
2. Product Features and Benefits
- Superior Engine Protection: Provides excellent engine protection for normal and severe driving conditions, including dirt roads, construction sites, stop-and-go traffic, short trips, and interstate travel.
- 5 Micron Filtration: Features a 5-micron filtration rating, ensuring fine particulate removal from fuel.
- Integrated Drain: Equipped with a drain for convenient water separation and removal.
- Compatibility: Suitable for Caterpillar Engines and Cummins Celect Engines. Note: A shorter version, model 3407, is available.
- Durable Construction: Constructed with a robust metal outer material for longevity.
3. Specifications
| Attribute | Value |
|---|---|
| Filter Style | Spin-On Fuel/Water Separator Filter |
| Fuel Filter Gasket O.D. | 2.83 inches (72 mm) |
| Fuel Filter Gasket Thickness | 0.21 inches (5 mm) |
| Fuel Filter Height | 9.805 inches (249 mm) |
| Fuel Filter Inlet Thread Size | 1 inch - 14 |
| Fuel Filter O.D. | 3.67 inches (93 mm) |
| Gasket I.D. | 2.46 inches (62 mm) |
| Outer Material | Metal |
| Item Weight | 1.68 pounds |
| Manufacturer Part Number | 3406 |
| UPC | 765809152922 |
4. Setup and Installation
Proper installation of the NAPA Gold Fuel Filter 3406 is crucial for optimal performance and engine protection. Always refer to your vehicle or equipment's service manual for specific installation procedures and safety precautions.
General Installation Steps:
- Safety First: Ensure the engine is off and cool. Disconnect the battery if necessary. Wear appropriate personal protective equipment (PPE), such as gloves and eye protection.
- Locate Old Filter: Identify the existing fuel filter. Place a drain pan underneath to catch any spilled fuel.
- Remove Old Filter: Carefully unscrew the old fuel filter. Be prepared for fuel spillage.
- Prepare New Filter: Apply a thin film of clean fuel or engine oil to the new filter's gasket. This helps ensure a proper seal.
- Install New Filter: Screw the new NAPA Gold Fuel Filter 3406 onto the filter head. Hand-tighten until the gasket makes contact, then tighten an additional 3/4 to 1 full turn, or as specified by the vehicle manufacturer. Do not overtighten.
- Check for Leaks: After installation, start the engine and check for any fuel leaks around the filter. If leaks are present, turn off the engine immediately and re-check the installation.
- Bleed Air (if necessary): Some fuel systems may require bleeding air after filter replacement. Consult your vehicle's service manual for this procedure.

Image: Bottom view of the NAPA Gold Fuel Filter 3406, showing the threaded inlet and the gasket. A separate gasket ring is also visible.

Image: Vertical view of the NAPA Gold Fuel Filter 3406, highlighting its cylindrical shape and the integrated drain at the bottom.
5. Operating Instructions
Once properly installed, the NAPA Gold Fuel Filter 3406 operates automatically as part of your vehicle's fuel system. It continuously filters fuel, removing contaminants and separating water to ensure clean fuel delivery to the engine. No user intervention is required during normal operation.
6. Maintenance
Regular maintenance of your fuel filter is essential for maintaining engine performance and longevity.
- Replacement Schedule: Replace the NAPA Gold Fuel Filter 3406 according to your vehicle or equipment manufacturer's recommended service intervals. These intervals can vary based on vehicle type, operating conditions, and fuel quality.
- Water Drain: Periodically drain accumulated water from the filter using the integrated drain, especially if operating in humid environments or if water contamination is suspected. Refer to your vehicle's service manual for the proper procedure for draining the fuel/water separator.
- Inspection: During routine maintenance, visually inspect the filter for any signs of damage, leaks, or corrosion.
7. Troubleshooting
While the NAPA Gold Fuel Filter 3406 is designed for reliable performance, issues related to fuel filtration can sometimes arise.
- Reduced Engine Performance: If you experience a noticeable decrease in engine power, rough idling, or difficulty starting, a clogged fuel filter could be a contributing factor.
- Fuel Leaks: If fuel leaks are observed around the filter, immediately shut off the engine and re-check the installation. Ensure the filter is tightened correctly and the gasket is properly seated.
- Water in Fuel System: If water contamination is suspected (e.g., engine sputtering, misfires), drain the fuel/water separator immediately.
If troubleshooting steps do not resolve the issue, it is recommended to consult a certified mechanic or NAPA service center.
8. Warranty Information
The NAPA Gold Fuel Filter 3406 comes with a manufacturer's warranty. For detailed information regarding warranty terms, conditions, and claim procedures, please refer to the official NAPA website or contact NAPA customer support directly. Keep your purchase receipt as proof of purchase.
9. Support
For further assistance, technical support, or inquiries regarding the NAPA Gold Fuel Filter 3406, please contact NAPA customer service or visit your local NAPA Auto Parts store.
NAPA Official Website: www.napaonline.com