PWM Fuel Pump Control for Three and Four Pump Forced Induction Systems Demanding Maximum Flow
The Aeromotive 66171 VaporWorx ReturnX is a return-type pulse width modulation controller engineered specifically for supercharged and forced induction builds running three or four brushed fuel pumps simultaneously. Unlike fixed-speed pump systems that run pumps at full voltage continuously, the 66171 uses PWM signal output to modulate pump speed based on actual fuel demand, reducing heat, noise, and electrical load during cruise while delivering full pump output under boost. It incorporates a standalone 2.5-bar MAP sensor of the LSA/LS9 type for boost reference and features primary and secondary PWM controller outputs operating in a leader-follower arrangement, making it compatible with Radium Engineering 3x and 4x fuel pump surge tank configurations.
Key Features
- Aeromotive 66171 return-type PWM controller for 3 or 4 pump supercharged applications
- 110A minimum continuous power rating, handles the combined load of triple or quad pump configurations
- Includes standalone 2.5-bar MAP sensor (LSA/LS9 type) for boost pressure reference
- Primary and secondary PWM outputs in leader-follower arrangement
- Compatible with Radium Engineering 3x and 4x fuel pump surge tank systems
- Works with any brushed-type fuel pumps
- ReturnX designation indicates return-type fuel system compatibility
- Reduces pump heat, electrical load, and noise under light throttle and cruise conditions
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | 66171 |
| Brand | Aeromotive |
| Product Line | VaporWorx ReturnX |
| System Type | Return-Type PWM Controller |
| Application | 3 or 4 Pump Systems, Supercharged / Forced Induction |
| Power Rating | 110A minimum continuous |
| MAP Sensor Included | Yes, 2.5-bar LSA/LS9 type |
| Output Channels | Primary + Secondary (Leader-Follower) |
| Pump Compatibility | Brushed-type fuel pumps |
| Prop 65 | Yes |
| UPC | N/A |
What’s Included
- 1 Aeromotive 66171 ReturnX PWM controller unit
- Standalone 2.5-bar MAP sensor (LSA/LS9 type)
- All necessary hardware for installation
About Aeromotive
Aeromotive has been at the forefront of high-performance fuel system engineering since 1994. Based in Lenexa, Kansas, Aeromotive designs and manufactures fuel pumps, regulators, filters, fittings, and complete fuel system solutions for street performance, drag racing, road racing, and extreme supercharged and turbocharged builds. The VaporWorx line represents Aeromotive’s latest PWM-based technology for demand-matched fuel delivery in modern high-horsepower applications.
Related Parts on Our Site
- Aeromotive 66138 VaporWorx Dual Pump Returnless PWM Controller
- Aeromotive 66166 VaporWorx ReturnX Dual Pump NA Controller
- Aeromotive 66141 VaporWorx Gen 2 CTS-V Returnless Controller
Frequently Asked Questions
What is the Aeromotive 66171?
The Aeromotive 66171 is the VaporWorx ReturnX PWM controller designed for supercharged and forced induction builds running three or four brushed fuel pumps. It uses pulse width modulation to match pump output to actual fuel demand, includes a 2.5-bar MAP sensor for boost reference, and operates on a leader-follower output arrangement for multi-pump surge tank applications.
What is the difference between ReturnX and Returnless VaporWorx controllers?
ReturnX models like the 66171 are designed for return-type fuel systems where excess fuel is routed back to the tank or surge tank. Returnless models are designed for systems where fuel pressure is managed without a return line. The correct choice depends entirely on your existing fuel system architecture and whether your vehicle or build uses a return or returnless configuration.
How many pumps does the Aeromotive 66171 support?
The 66171 supports three or four brushed-type fuel pumps using its primary and secondary PWM outputs in a leader-follower configuration. This makes it the correct controller for high-demand applications like twin-turbocharged or supercharged builds exceeding 1,000 horsepower that require multiple large-capacity in-tank or surge-tank pumps.
Is the Aeromotive 66171 compatible with Radium Engineering surge tanks?
Yes. The 66171 is specifically listed as compatible with Radium Engineering 3x and 4x fuel pump surge tank systems. If you are building around a Radium triple or quad pump surge tank for a high-power forced induction application, the 66171 provides the correct leader-follower PWM output channels to drive those configurations.
What does the 2.5-bar MAP sensor do in the 66171 system?
The included 2.5-bar MAP sensor provides a boost pressure signal to the 66171 controller, allowing it to automatically ramp pump speed in proportion to intake manifold pressure. This ensures pumps deliver maximum flow under high boost without requiring manual tuning and without running at full speed during idle or part-throttle driving.
What is the minimum power rating for the Aeromotive 66171?
The 66171 requires a minimum continuous power feed rated at 110 amps to handle the combined current draw of three or four high-flow fuel pumps running simultaneously at full output. Wiring gauge, fusing, and relay selection must be sized accordingly during installation.
Can the Aeromotive 66171 be used with turbocharged applications?
Yes. While the product description references supercharged applications, any forced induction system requiring a return-type fuel setup with three or four brushed pumps can use the 66171. The 2.5-bar MAP sensor covers typical boost ranges for both supercharged and turbocharged high-horsepower builds.
Does the Aeromotive 66171 require tuning?
The 66171 uses the onboard MAP sensor to automatically modulate pump speed, reducing the need for complex standalone tuning. However, for extreme builds and precise fuel system calibration, integration with an ECU or standalone fuel management system may provide additional control over pump staging and output curves. Consult Aeromotive’s technical documentation for advanced configuration options.
Installation Instructions
- Confirm your fuel system is a return-type design compatible with the Aeromotive 66171 ReturnX controller.
- Mount the controller in a location with adequate ventilation and away from direct heat sources.
- Install the included 2.5-bar MAP sensor in the intake manifold or a suitable plenum port.
- Wire primary PWM output to the first pump relay or pump directly, following Aeromotive wiring diagram.
- Wire secondary PWM output to the second pump group in the leader-follower configuration.
- Ensure the main power feed is fused and wired with a minimum 110A capacity wire gauge.
- Power the controller on and verify MAP sensor signal at idle before advancing to full boost testing.
- Confirm fuel pressure holds stable under full load before returning the vehicle to service.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
