1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Rule-Mate RM1500A Automated Bilge Pump. This pump is designed for efficient and reliable water removal from your boat's bilge, featuring an integrated water level sensor that eliminates the need for a traditional float switch. It is capable of pumping up to 1500 Gallons Per Hour (GPH) and operates on a 12-volt power supply.
For detailed installation instructions, please refer to the official Installation Manual (PDF).
2. Safety Information
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
- Always disconnect power before installing, servicing, or performing any maintenance on the pump.
- Ensure all electrical connections are properly sealed and protected from water ingress to prevent short circuits and corrosion.
- Do not operate the pump dry for extended periods, as this can cause damage to the motor.
- Verify that the pump's voltage (12V) matches your boat's power supply.
- Install the pump in an accessible location for inspection and maintenance.
3. Product Overview
The Rule-Mate RM1500A is an automated bilge pump designed for reliable water removal. Its compact size and durable plastic construction ensure long-lasting performance in marine environments.

Figure 3.1: Rule-Mate RM1500A Automated Bilge Pump. This image shows the pump's main body, which is white with a blue base, and the Rule-Mate 1500 logo on top.

Figure 3.2: Rule-Mate RM1500A Automated Bilge Pump with dimensions. The pump measures approximately 8 inches in length, 7 inches in width, and 5 inches in height.
Video 3.1: Product Overview Video. This video provides a visual introduction to the Rule-Mate RM1500A Automated Bilge Pump, highlighting its features and components.
4. Setup
4.1 Installation
- Mounting: Securely mount the bilge pump in the lowest part of the bilge where water collects. Ensure it is level and stable.
- Wiring: Connect the pump to your boat's 12-volt DC power source. Follow the wiring diagram provided in the full installation manual. Ensure all connections are watertight.
- Hose Connection: Attach the appropriate discharge hose to the pump's threaded discharge port. The pump comes with various fittings (1" NPT discharge, 1" and 1 1/8" screw-on hose barb ports) to simplify installation. Route the hose to a suitable through-hull fitting above the waterline.
- Testing: After installation, test the pump by adding water to the bilge to ensure it activates and removes water correctly.
5. Operating Instructions
The Rule-Mate RM1500A operates automatically, requiring no manual intervention for typical use. Its integrated water level sensor detects the presence of water and activates the pump accordingly.
- Automatic Activation: The pump will activate automatically when the water level in the bilge reaches approximately 2-3/4 inches (70mm).
- Automatic Shut-off: The pump will automatically shut off when the water level drops to approximately 5/8 inches (16mm), optimizing efficiency and preserving battery life.
- Backup Mode: In the event of debris interfering with normal operation, the pump features a backup mode. It will cycle every 2.5 minutes to attempt to clear any obstructions and continue pumping.
- Eco-Friendly Technology: The pump utilizes 'field effect' technology, which distinguishes water from oil, preventing false starts and ensuring the pump only activates when water is present.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your bilge pump.
- Regular Inspection: Periodically inspect the pump, wiring, and hose connections for any signs of wear, damage, or corrosion.
- Clean Bilge Area: Keep the bilge area clean and free of debris, oil, and other contaminants that could clog the pump intake or interfere with the sensor.
- Check Intake Screen: Ensure the intake screen at the base of the pump is clear of any obstructions. Clean it regularly to maintain maximum flow.
- Test Operation: Manually test the pump's operation periodically by adding water to the bilge to confirm automatic activation and shut-off.
7. Troubleshooting
If you encounter issues with your Rule-Mate RM1500A, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not turn on | No power, blown fuse, loose wiring, clogged intake, faulty sensor. | Check power supply and fuse. Inspect and tighten all wiring connections. Clear any debris from the intake screen. If sensor is suspected, consult a professional. |
| Pump runs continuously | Sensor malfunction, airlock in hose, backflow, pump not mounted level. | Ensure pump is level. Check for airlocks in the discharge hose. Verify sensor is clean and functioning. Install a check valve if backflow is an issue. |
| Pump runs but no water is discharged | Clogged discharge hose, pump airlocked, impeller damaged. | Clear any blockages in the discharge hose. Remove pump and clear any airlocks. Inspect impeller for damage. |
| Pump cycles on/off frequently | Small amount of water in bilge, sensor sensitivity, minor leak. | This can be normal for small water accumulation. Ensure no small leaks are causing constant activation. |
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | RM1500A |
| Brand | Rule |
| Flow Rate | 1500 GPH (Gallons Per Hour) / 6819 LPH (Liters Per Hour) |
| Voltage | 12 Volts |
| Power Source | AC/DC |
| Material | Plastic |
| Color | Beige |
| Product Dimensions | 8"L x 7"W x 5"H |
| Item Weight | 4.3 Pounds |
| Maximum Flow Rate | 25 Gallons Per Minute |
| Manufacturer | Flow Control, LLC |
| UPC | 042237114198 |
9. Warranty
The Rule-Mate RM1500A Automated Bilge Pump comes with a manufacturer's warranty. Please refer to the product packaging or the official Rule website for specific warranty terms and conditions. Extended protection plans may also be available for purchase.
10. Support
For further assistance, technical support, or to explore other Rule products, please visit the official Rule Store on Amazon or contact Flow Control, LLC, the manufacturer.

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