Introduction
This manual provides essential instructions for the safe and efficient operation, installation, and maintenance of your Fimco High-Flo 5151086 12V Diaphragm Sprayer Pump. Please read this manual thoroughly before use and retain it for future reference.
Safety Information
WARNING: Failure to follow these safety instructions may result in injury or property damage.
- Electrical Safety: This pump operates on 12 Volt DC power. Ensure proper electrical connections and use a 5 Amp fuse as recommended to prevent electrical overload.
- Chemical Compatibility: This pump is designed for use with various liquids, including Round-Up and other herbicides. Always consult the chemical manufacturer's instructions for safe handling, mixing, and application.
- Flammable Liquids: DO NOT USE TO PUMP FLAMMABLE OR COMBUSTIBLE LIQUIDS. This can cause fire or explosion.
- Freezing Protection: Protect the pump from freezing temperatures. Drain the pump completely after each use in cold weather to prevent damage.
- Personal Protective Equipment: Always wear appropriate personal protective equipment (PPE) when operating the sprayer pump, especially when handling chemicals.
Product Overview
The Fimco High-Flo 5151086 is a high-performance 12V diaphragm sprayer pump designed for various spraying applications. It features durable construction and efficient operation.
Key Features:
- 12 Volt DC power compatibility.
- Equipped with Viton valves for chemical resistance.
- Features a Santoprene Diaphragm for durability.
- Designed to fit most popular sprayers.
- Recommended 5 Amp fuse for protection.

Figure 1: Fimco High-Flo 5151086 12V Diaphragm Sprayer Pump. This image shows the red and black pump unit with its input and output ports, mounted on a black base. The product label with "HIGH PERFORMANCE" is visible on the side.
Specifications
| Brand | Fimco |
| Model Number | 5151086 (Item model number: 61-5438) |
| Color | Black |
| Material | Viton (Valves), Santoprene (Diaphragm) |
| Style | High Performance On Demand |
| Product Dimensions (L x W x H) | 8.5" x 3.25" x 4.25" |
| Power Source | 12V DC, Battery Powered |
| Item Weight | 16 ounces (1 pound) |
| Maximum Flow Rate | 1.2 Gallons Per Minute (GPM) |
| Maximum Pressure | 60 PSI |
| Recommended Fuse | 5 Amp |
| Manufacturer | Fimco Industries |
| UPC | 733029118134 |
Setup and Installation
Follow these steps to properly set up your Fimco High-Flo sprayer pump:
- Mounting: Securely mount the pump to a stable surface using the integrated mounting feet. Ensure the pump is positioned to allow for easy connection of hoses and access to electrical terminals.
- Hose Connections: Connect the inlet hose from your liquid source (e.g., sprayer tank) to the pump's inlet port. Connect the outlet hose to your spray wand or nozzle. Ensure all connections are tight to prevent leaks. The pump features quick attach port connections for convenience.
- Electrical Connection: Connect the pump's 12V DC power leads to a compatible 12V power source (e.g., battery). Ensure correct polarity (red to positive, black to negative). Install a 5 Amp fuse in the positive power line to protect the pump and electrical system.
- Priming: The pump is self-priming up to a certain lift. For best results, ensure the inlet hose is submerged in liquid before starting the pump.
Operating Instructions
Once the pump is properly installed and connected, follow these steps for operation:
- Prepare Liquid: Fill your sprayer tank with the desired liquid, ensuring it is properly mixed according to chemical manufacturer instructions.
- Power On: Connect the 12V power source to the pump. The pump will begin to operate, building pressure.
- Spraying: Activate your spray wand or nozzle. The pump will maintain a flow rate of up to 1.2 GPM and pressure up to 60 PSI, providing consistent spray.
- Power Off: When finished spraying, disconnect the 12V power source from the pump.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your pump:
- Flushing After Use: After each use, especially when spraying chemicals, FLUSH THE PUMP THOROUGHLY with clean water. For best results, use a tank neutralizer and cleaner such as Fimco #5173005 to remove chemical residues and prevent corrosion.
- Winterization: To prevent damage from freezing, PROTECT FROM FREEZING temperatures. Completely drain all liquid from the pump and hoses before storing in cold conditions. Running a small amount of RV antifreeze through the pump can also provide protection.
- Inspection: Periodically inspect hoses, connections, and electrical wiring for wear, damage, or leaks. Replace any damaged components immediately.
- Cleaning: Keep the exterior of the pump clean and free of debris.
Troubleshooting
If you encounter issues with your pump, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not run | No power, blown fuse, loose electrical connection. | Check 12V power source. Inspect and replace the 5 Amp fuse if blown. Ensure all electrical connections are secure. |
| Low flow or pressure | Clogged inlet filter, kinked hose, air leak in inlet line, worn diaphragm. | Clean or replace inlet filter. Straighten hoses. Check all inlet connections for air leaks. If diaphragm is worn, replacement may be necessary. |
| Pump runs but no prime | Inlet hose not submerged, air leak in inlet line, pump not self-priming due to excessive lift. | Ensure inlet hose is fully submerged. Check all inlet connections for air leaks. Reduce the vertical lift if possible. |
| Leaking from pump head | Loose screws, damaged O-rings or diaphragm. | Tighten screws on the pump head. Inspect and replace O-rings or diaphragm if damaged. |
Warranty and Support
For warranty information or technical support, please contact Fimco Industries directly. Keep your purchase receipt as proof of purchase. Note that this product is listed as "Discontinued By Manufacturer," which may affect the availability of new parts or direct manufacturer support. It is advisable to check with Fimco Industries for current support options or compatible replacement parts.
Manufacturer: Fimco Industries





