1. Introduction
Thank you for choosing the Generic 520-590 Fuel Pump Replacement Part. This manual provides essential information for the proper installation, operation, and maintenance of your new fuel pump. Please read this manual thoroughly before installation to ensure correct usage and to prevent damage to the product or equipment.
2. Product Description
This product is a replacement fuel pump designed for various lawnmower and string trimmer accessories. It is engineered to provide reliable fuel delivery to your equipment's engine, ensuring optimal performance. The pump features a durable construction suitable for demanding outdoor applications.

Image: Front view of the Generic 520-590 Fuel Pump Replacement Part, showing the main body and connection ports.
3. Compatibility
This fuel pump is a replacement part compatible with various equipment, including those from Stenns (520-590 series), John Deere, and Brigg. It is crucial to verify compatibility with your specific equipment model before installation. Please compare the provided photos and model number (pumpart#252506) with your original part to ensure a correct fit.

Image: Angled view of the fuel pump, highlighting the input and output ports.

Image: Another angled view, showing the mounting points and overall compact design.

Image: Top-down view of the fuel pump, showing the central diaphragm area and screw placements.
4. Package Contents
The package includes:
- 1 x Generic 520-590 Fuel Pump Replacement Part Set
NOTE: Package includes 1 Set ONLY. Please ensure all components are present upon unboxing.
5. Setup and Installation
Safety First: Always disconnect the spark plug wire and ensure the engine is cool before attempting any installation or maintenance. Wear appropriate personal protective equipment (PPE) such as gloves and eye protection.
- Preparation: Ensure the equipment's fuel tank is empty or fuel lines are clamped to prevent spills. Have appropriate tools ready.
- Locate Old Pump: Identify the existing fuel pump on your equipment. Note the orientation of the fuel lines.
- Disconnect Lines: Carefully disconnect the fuel lines from the old pump. Be prepared for residual fuel.
- Remove Old Pump: Unscrew or unclip the old fuel pump from its mounting bracket.
- Install New Pump: Position the new Generic 520-590 fuel pump in the same orientation as the old one. Secure it using the existing mounting hardware.
- Connect Lines: Reconnect the fuel lines to the new pump, ensuring a snug and secure fit to prevent leaks. Double-check that the input and output lines are connected correctly.
- Final Check: Inspect all connections for tightness and ensure no fuel leaks are present before starting the engine.
If you are unsure about any step, it is recommended to consult a qualified technician or refer to your equipment's specific service manual.
6. Operating
After successful installation, the fuel pump will operate automatically as part of your equipment's fuel system. Ensure the fuel tank contains clean, appropriate fuel for your equipment. Monitor for any unusual noises or fuel delivery issues during initial operation.
7. Maintenance
To ensure the longevity and optimal performance of your fuel pump:
- Regular Inspection: Periodically check fuel lines and connections for cracks, wear, or leaks.
- Fuel Quality: Always use clean, fresh fuel as recommended by your equipment manufacturer. Contaminated fuel can damage the pump.
- Filter Check: If your equipment has an inline fuel filter, inspect and replace it as per your equipment's maintenance schedule to prevent debris from reaching the pump.
- Storage: When storing equipment for extended periods, follow your equipment manufacturer's guidelines for fuel stabilization or draining to prevent fuel system issues.
8. Troubleshooting
If you experience issues after installing the new fuel pump, consider the following:
- No Fuel Delivery: Check if fuel lines are kinked or blocked. Ensure the fuel tank has sufficient fuel. Verify all connections are secure.
- Fuel Leaks: Re-tighten all fuel line connections. Inspect fuel lines for cracks or damage that may require replacement.
- Engine Stalling/Rough Running: This could indicate inconsistent fuel flow. Check for air in the fuel lines or a clogged fuel filter (if applicable).
For persistent issues, consult your equipment's service manual or a professional mechanic.
9. Specifications
| Attribute | Detail |
|---|---|
| Part Number | 520-590 |
| Model Number | pumpart#252506 |
| Brand | Generic |
| Manufacturer | Generic |
| ASIN | B0DZ635293 |
| Date First Available | March 4, 2025 |
10. Warranty and Support
Specific warranty information for this Generic replacement part is not provided in the product details. For any warranty claims or technical support, please contact the seller or retailer from whom you purchased the product. Retain your proof of purchase for any inquiries.