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A circuit opening relay is a critical component in your vehicle's fuel system, responsible for activating the fuel pump. Ensuring you select a high-quality replacement is paramount for maintaining optimal engine performance and preventing potential starting issues. This guide will help you navigate the options available for this essential automotive part.
Fits list of vehicles in image gallery fitment chart
Exceptional Quality and Performance: This OE replacement circuit opening relay is designed to meet, if not exceed, the performance and quality standards of the original equipment installed on your vehicle. Experience the same high-level performance as...
Direct Replacement, No Fuss: This OE replacement circuit opening relay is meticulously designed for your specific vehicle's make and model, promising a direct fit. Installation is as straightforward as it gets - no fuss, no complications. Experience a...
Perfect Compatibility: Compatibility is key. Make sure to check our product specifications (in image gallery) to confirm that this OE replacement circuit opening relay matches your vehicle's requirements. Get the perfect fit and optimal performance every...
The Fuel Pump Main Relay Compatible for： 2001-2002 CL, 2001-2002 MDX, 1999-2001 TL
The Fuel Pump Main Relay Compatible for：1998-2002 Accord, 1998-2004 Odyssey, 2003-2004 Pilot, 1998-2001 Prelude
Part Number：RZ-0159 39400-S84-003 39400S82A01 39400S84A01
The RZ-0159 Fuel Pump Circuit Opening Relay is designed to regulate fuel delivery to your engine, ensuring consistent and reliable performance. By activating the fuel pump circuit at the precise moment, this relay safeguards the fuel pump from potential...
Please use the parts search tool in the upper left corner check year/brand/model to make sure our part are same as your old one.
✅【OE Standards:】Our Product Is Designed And Manufactured With Modern Tooling, Ensuring Optimal Quality And Reliability
✅【Quality Manufacturing:】Replacement Parts are Specifically Designed to the Same Specifications and Use Better, More Durable Materials Than Those Provided by the OEM
✅【Direct Replacement:】Our Direct Fit Replacement Product Installs Seamlessly, Just Like the Factory Unit
✅【Road Tested:】Each Product Undergoes Rigorous Inspection to Ensure Utmost Reliability and Quality
Intelligent Fuel Control: Expertly engineered as a primary Circuit Opening Relay (EFI), providing precise, responsive power management to the main fuel pump for consistent engine performance.
Stall Safety Cut-Off: Designed with safety-critical internal circuitry that instantly interrupts the fuel supply if the engine unexpectedly stalls, preventing dangerous fuel flooding and ensuring absolute system safety.
Heritage Platform Fit: Tailored for seamless integration into legendary classic platforms, including Land Cruiser, Corolla (AE86), and MR2. Please verify your original part number before purchasing.
Precision 5-Pin Configuration: Identified by models 85910-30050, 85910-32030, and 061000-0352, it utilizes a standardized 5-pin layout to offer secure, direct plug-in connections without modifications.
Vintage System Restoration: Constructed with a heavy-duty, tightly sealed enclosure and upgraded internal contacts to withstand extreme off-road vibrations and high engine bay temperatures for lasting durability.
✔Compatible with: For 1998-2002 Honda Accord丨1998-2004 Honda Odyssey丨2003-2004 Honda Pilot丨1998-2001 Honda Prelude. For 2001-2003 Acura CL丨2001-2002 Acura MDX丨1999-2003 Acura TL. Please check the second main picture to confirm circuit opening...
✔Reliable Fuel Pump Functionality: The RZ-0159 Fuel Pump Circuit Opening Relay is engineered to maintain consistent fuel delivery to your engine, ensuring smooth and reliable performance. By opening the fuel pump circuit at the correct time, this relay...
✔High-Durability Construction: Built with high-quality PP plastics materials, the RZ-0159 relay is designed to withstand the rigors of engine operation and environmental conditions. Its robust construction ensures long-term reliability and performance...
✔Simple Installation: This fuel pump relay is designed for easy installation. It features a user-friendly plug-and-play design that allows for straightforward replacement of the old or faulty relay, restore your vehicle’s fuel system functionality...
✔After-Sales Service: We offer 24 hours customer service and 1 year product service, If you are encounter product installation, product quality and other problems, please feel free to contact us.
Last update on 2026-07-10 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Automotive Replacement Circuit Opening Relays
Maintenance and Lifespan
Circuit opening relays are generally designed for long-term use, but they can fail over time due to wear and tear or electrical issues. Symptoms of a failing relay can include intermittent starting problems, the engine cutting out unexpectedly, or a complete lack of fuel pump operation. Regular visual inspection for corrosion or damage can help identify potential issues early.
Frequently Asked Questions
What are the common symptoms of a failing circuit opening relay?
Common signs include difficulty starting the engine, the engine stalling after starting, or intermittent power loss while driving. You might also notice the engine cranks but doesn't start, indicating a lack of fuel delivery.
How do I know if my car needs a new circuit opening relay?
If your fuel pump isn't engaging when the ignition is turned on (you won't hear the usual hum) and the engine won't start or runs erratically, the relay is a likely culprit. Testing the relay's functionality with a multimeter is a good diagnostic step.
Can I use a universal circuit opening relay if the exact part is unavailable?
While some universal relays exist, it's highly recommended to use a part specifically designed for your vehicle's make and model. Incorrect wiring or specifications can lead to electrical problems or damage to your fuel system.
What is the difference between a circuit opening relay and a fuel pump relay?
In many vehicles, these terms refer to the same component. The circuit opening relay's primary function is to control the fuel pump's operation, hence the interchangeable use of the terms.
How long does a circuit opening relay typically last?
A well-functioning relay can last the lifetime of the vehicle, often exceeding 100,000 miles. However, factors like electrical stress, heat, and vibration can shorten their lifespan.
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