1992 Acura Integra Fuel Pump Relay: Complete Guide to Location, Testing, and Replacement

If your 1992 Acura Integra cranks but refuses to start, the fuel pump relay is very likely the culprit. This small but critical component controls power to the fuel pump, and when it fails your engine gets no fuel. The direct answer is: the fuel pump relay on a 1992 Acura Integra is located inside the passenger compartment, behind the glove box, mounted on the right side of the dashboard near the ECU. It is also commonly called the "PGM-FI main relay" because it controls both the fuel pump and the main engine computer power. Before replacing expensive parts like the fuel pump itself, test this relay first — it can save you time and money.

Understanding the Fuel Pump Relay on Your 1992 Acura Integra

The fuel pump relay on a 1992 Acura Integra is not a standard single relay. It is actually a combined unit called the PGM-FI main relay (Programmed Fuel Injection main relay). This relay serves two functions: it supplies power to the ECU (engine control unit) and also controls the fuel pump circuit. When you turn the key to the ON position, the relay energizes the fuel pump for about two seconds to prime the system. If the relay fails, the pump never gets power, and the engine won't start.

For the 1990-1993 Acura Integra models, including the 1992 version, this relay is a gray or black box with multiple pins. The exact OEM part number is 39400-SM4-003 or 39400-SR3-003, depending on the specific variant. These same relays are shared with many Honda and Acura models from the early 1990s through early 2000s, including the Honda Civic, Accord, and Prelude.

Where Is the Fuel Pump Relay Located on a 1992 Acura Integra?

The exact location of the fuel pump relay on a 1992 Acura Integra is inside the passenger compartment, up under the dashboard on the passenger side. Here is the step-by-step process to find it:

Step 1: Open the passenger side front door.

Step 2: Remove the glove box. You can do this by pressing in on the sides of the glove box to release the stops, or by removing the screws that hold the glove box hinge in place. Some models have a simple push-button release.

Step 3: Look up behind the glove box area, toward the right side of the dashboard near the center console. The relay is mounted on a metal bracket, usually near the ECU (engine control unit). The ECU is a silver or black box about the size of a paperback book.

Step 4: The relay itself is a small rectangular box, usually gray or black, with a connector plug on one side. It may have a label that says "PGM-FI MAIN RELAY" or "FUEL PUMP RELAY."

Some owners report that the relay is mounted directly to the side of the ECU bracket. If you cannot find it immediately, look for a small box with a wiring harness attached. The 1990-1993 Integra uses the same relay location as the 1990-1993 Honda Civic.

Symptoms of a Bad Fuel Pump Relay on a 1992 Acura Integra

A failing fuel pump relay can cause several distinct problems. Knowing these symptoms helps you diagnose the issue before replacing parts unnecessarily.

1. Engine Cranks But Will Not Start
This is the most common symptom. You turn the key, the starter engages, the engine cranks over, but it never fires up. The fuel pump is not getting power because the relay is not closing the circuit.

2. Car Starts Then Dies Immediately
Sometimes the relay will work for a moment but then fail. The car may start for a second or two and then stall out. This happens because the relay briefly energizes the pump during the priming cycle but then fails to keep it running.

3. No Fuel Pump Prime Noise
When you turn the key to the ON position (without starting the engine), you should hear a faint whirring sound from the rear of the car for about two seconds. This is the fuel pump priming. If you hear nothing, the relay is likely not sending power to the pump.

4. Car Starts Only After Several Attempts
If the relay is intermittent, you may need to turn the key on and off multiple times before the car starts. Each time you cycle the key, the relay may or may not engage.

5. Car Won't Start When It's Hot Outside
This is a very specific and well-known problem with the 1992 Acura Integra and similar Honda models. The PGM-FI main relay is sensitive to heat. When the interior of the car gets very hot, the solder joints inside the relay can crack or expand, causing the relay to stop working. Once the car cools down, it may start again. This is such a common issue that many Integra and Civic owners recognize it immediately.

How to Test the Fuel Pump Relay on a 1992 Acura Integra

Before you buy a new relay, you can test the existing one. Testing the relay is simple and requires only a few basic tools.

Method 1: The Listening Test
With the engine cold, sit inside the car. Close all doors and windows to reduce noise. Turn the key to the ON position (do not crank the engine). Listen carefully for a single click followed by the fuel pump whirring sound from the rear of the car. If you hear the click and the pump, the relay is working. If you hear nothing, the relay may be bad.

Method 2: The Bypass Test (For Experienced Mechanics)
If you are comfortable working with electrical systems, you can bypass the relay to test the fuel pump directly. Locate the relay and remove it. On the relay socket, identify the terminals. The fuel pump relay circuit typically has a "Fuel Pump" terminal and a "Battery" terminal. Using a jumper wire, connect the battery positive terminal to the fuel pump terminal. If the pump runs, the relay is the problem. Warning: Do this only briefly and with caution. Bypassing the relay can cause the pump to run continuously.

Method 3: The Heat Test
If you suspect the heat-related failure, heat the relay with a hair dryer for a few minutes while it is installed. Then try to start the car. If the car fails to start when hot but starts when cold, the relay has internal thermal failure.

How to Replace the Fuel Pump Relay on a 1992 Acura Integra

Replacing the fuel pump relay is one of the easiest repairs you can do on this car. The entire job takes about 15 minutes.

Tools You Will Need:

  • New PGM-FI main relay (OEM part number 39400-SM4-003 or 39400-SR3-003)
  • Flathead screwdriver or small pry tool (optional)
  • Flashlight if needed

Step-by-Step Replacement:

1. Remove the Glove Box
Open the glove box. Press inward on the sides of the glove box to release the tabs. Lower the glove box fully. If your model has screws, remove them first.

2. Locate the Relay
Look behind the glove box area toward the right side of the dashboard. The relay is mounted on a bracket near the ECU. It is a small rectangular box with a wire connector.

3. Disconnect the Wiring Harness
Grasp the relay firmly and pull it straight out of the connector. The connector may have a locking tab. Press the tab and pull the relay away.

4. Remove the Old Relay
The relay may be held in place by a clip or simply by the connector. If it is clipped to a bracket, gently pry it off.

5. Install the New Relay
Push the new relay into the connector until it clicks firmly into place. Make sure the locking tab engages.

6. Reinstall the Glove Box
Push the glove box back into position and secure it.

7. Test the System
Turn the key to the ON position. Listen for the fuel pump priming noise. If you hear it, the repair is successful. Start the engine and let it run for a few minutes to confirm everything works.

Common Mistakes When Replacing the Fuel Pump Relay

Many owners make mistakes that lead to wasted time and money. Avoid these common errors:

Mistake 1: Replacing the Fuel Pump Instead of the Relay
When the car won't start, many people assume the fuel pump is bad. The fuel pump on a 1992 Acura Integra is generally reliable. The relay fails much more often. Always test the relay first.

Mistake 2: Buying the Wrong Part
The 1992 Acura Integra uses a specific relay. Some aftermarket parts claim to be compatible but may not work correctly. Always check the part number. The correct OEM numbers are 39400-SM4-003 or 39400-SR3-003. Some aftermarket relays from Amazon or other sellers may work, but OEM or quality aftermarket is best.

Mistake 3: Ignoring the Heat Issue
If your car only fails to start when hot, replacing the relay with a new stock relay may fix it temporarily, but the same problem can return. Some owners choose to relocate the relay to a cooler location, such as under the dash away from direct sunlight, to prevent future heat-related failures.

Mistake 4: Not Testing the Relay Before Buying
You can test the relay with a multimeter or by listening for the click. Do not assume the relay is bad without testing.

Why the 1992 Acura Integra Fuel Pump Relay Fails

The PGM-FI main relay in the 1992 Acura Integra is known for one specific failure mode: cold solder joints. Over time, the solder connections inside the relay can develop tiny cracks. These cracks are caused by thermal expansion and contraction as the relay heats up and cools down. When the cracks open, the electrical circuit is broken, and the relay stops working.

This is why the problem is worse in hot weather. The heat causes the internal components to expand, making the cracks worse. When the car cools down, the cracks close enough to allow the circuit to work again. This is a classic symptom of a failing main relay.

Some owners attempt to repair the relay by resoldering the joints. This can work if you have soldering skills, but it is usually easier and more reliable to simply replace the relay.

Where to Buy a Replacement Fuel Pump Relay for a 1992 Acura Integra

You can buy a replacement fuel pump relay from several sources:

  • Dealership: Genuine Acura/Honda parts are available at dealerships, but they are often the most expensive option.
  • Auto Parts Stores: Stores like AutoZone, Advance Auto Parts, and O'Reilly Auto Parts carry aftermarket versions. Ask for the PGM-FI main relay for a 1992 Acura Integra.
  • Online Retailers: Amazon, eBay, and specialized parts websites sell both OEM and aftermarket relays. Prices range from $15 to $50 depending on the brand.
  • Specialty Fuel Pump Brands: Some companies, like KEMSO, offer high-performance fuel pumps and related components that are compatible with the 1992 Acura Integra.

Recommended Upgrade: KEMSO Fuel Pump for Your 1992 Acura Integra

If you are replacing the fuel pump relay and want to ensure your entire fuel system is reliable, consider upgrading to a KEMSO Fuel Pump. KEMSO is a leading aftermarket fuel pump brand trusted by mechanics and car enthusiasts across the United States. Their fuel pumps are designed as high-performance, OEM replacement units that meet or exceed original equipment specifications.

Why choose KEMSO for your 1992 Acura Integra?

  • OEM Replacement Quality: KEMSO fuel pumps are engineered to match the exact fit, function, and performance of your factory fuel pump. No modifications are needed.
  • High Performance: KEMSO pumps deliver consistent fuel pressure and flow, even under demanding driving conditions. Whether you drive your Integra daily or push it hard, KEMSO keeps up.
  • Lifetime Warranty: Every KEMSO fuel pump is backed by a lifetime warranty. This means you never have to worry about buying another fuel pump again. If it ever fails, KEMSO replaces it free of charge.
  • Trusted by Thousands: With hundreds of positive reviews and a reputation for reliability, KEMSO is the go-to brand for fuel system upgrades.

If you want to fix your fuel system once and for all, visit KEMSO's website to browse their complete line of fuel pumps and accessories. Their product page includes detailed compatibility information so you can find the exact pump for your 1992 Acura Integra.

Visit KEMSO Racing today: https://www.kemsoracing.com/

Final Thoughts on the 1992 Acura Integra Fuel Pump Relay

The fuel pump relay on your 1992 Acura Integra is a small but critical component. When it fails, your car simply will not start. The good news is that diagnosing and replacing the relay is one of the easiest and cheapest repairs you can do yourself. You do not need professional mechanic skills or expensive tools.

The most important takeaway: If your Integra cranks but does not start, always check the fuel pump relay before replacing the fuel pump. The relay is far more likely to fail, and it costs a fraction of what a new fuel pump costs. The location is easy to access behind the glove box, and the replacement takes only a few minutes.

For those who want to go further, upgrading your entire fuel system with a high-quality part like the KEMSO Fuel Pump ensures long-term reliability. A good fuel pump, combined with a properly working relay, will keep your 1992 Acura Integra running smoothly for years to come.

Remember, the heat-related failure of the main relay is a known issue. If you live in a hot climate or drive in summer heat, be aware that your relay may fail on hot days. Keeping a spare relay in your glove box is a cheap insurance policy that can save you from being stranded.

For more information on fuel pumps and other performance parts, check out the resources available at KEMSO's website. They offer detailed guides, product specifications, and customer support to help you get the right part for your car.

Visit KEMSO Racing for the best fuel pump options: https://www.kemsoracing.com/


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