July 2026

2001 Honda Accord Fuel Pump Relay: Location, Symptoms, and How to Fix It

If your 2001 Honda Accord cranks but won't start, or starts and then stalls unexpectedly, the fuel pump relay is likely the culprit. This small but critical component is one of the most common failure points on Honda Accords of this era, and replacing it is a simple, inexpensive fix that can save you hundreds of dollars in unnecessary diagnostic fees or fuel pump replacements.

The fuel pump relay on a 2001 Honda Accord is located in the under-dash fuse box on the driver's side, near the steering column. It is also commonly referred to as the "PGM-FI Main Relay" because it controls power to both the fuel pump and the engine control unit (ECU). This relay is known to fail over time, especially in hot weather, due to deteriorating solder joints inside the unit.

In this guide, we'll walk you through everything you need to know: where to find the relay, how to tell if it's bad, how to test it, how to replace it, and what to do if the relay isn't the problem.

Why the Fuel Pump Relay Matters

Before we get into the location, it helps to understand what this relay actually does. The fuel pump relay acts as a remote-controlled switch. When you turn your ignition key to the "ON" position, the ECU sends a small electrical signal to the relay. That signal energizes the relay's internal coil, which closes a circuit, allowing battery voltage to flow directly to the fuel pump. The fuel pump then runs for about two to three seconds to prime the fuel system before the engine starts.

Once the engine is running, the ECU keeps the relay energized so the fuel pump continues to deliver fuel. If the relay fails, the fuel pump never gets power, and your engine gets no fuel. That means no start, no matter how good your battery, starter, or spark plugs are.

The 2001 Accord uses a "main relay" system, which combines the fuel pump relay and the ECU relay into a single unit. This is also known as the PGM-FI main relay. It is larger than a standard mini relay and typically has seven terminals.

Symptoms of a Bad Fuel Pump Relay on a 2001 Honda Accord

Knowing the symptoms can help you diagnose the problem before you even start digging into the dashboard. Here are the most common signs of a failing fuel pump relay on a 2001 Accord:

1. Engine cranks but won't start. This is the most obvious symptom. You turn the key, the starter motor spins the engine, but it never fires up. You may not hear the fuel pump prime (a faint whining or buzzing sound from the rear of the car) when you turn the key to ON.

2. Intermittent stalling. The relay can fail intermittently, especially when hot. You might drive for miles without issue, then suddenly the engine dies. After letting the car cool down for 15-30 minutes, it starts again. This is a classic sign of a failing main relay.

3. No fuel pump prime sound. When you turn the ignition to the ON position (without cranking), you should hear a brief whirring or buzzing sound from the rear of the car near the fuel tank. That's the fuel pump pressurizing the system. If you hear nothing, the relay may not be sending power to the pump.

4. Engine starts but dies immediately. Sometimes the relay will close long enough to prime the pump and start the engine, but then loses power once the key is released. This happens when the internal contacts are worn or corroded.

5. Problem is worse in hot weather. The main relay in Hondas is notoriously heat-sensitive. As the relay ages, heat causes the internal solder joints to crack or weaken, leading to intermittent electrical failure. If your car only acts up on hot summer days, the relay is almost certainly the problem.

2001 Honda Accord Fuel Pump Relay Location: Step-by-Step

Finding the fuel pump relay on a 2001 Honda Accord is straightforward once you know where to look. Here is the exact location and how to access it.

Step 1: Get into the driver's footwell. Sit in the driver's seat and look under the dashboard, to the left of the steering column. You'll see a plastic fuse box cover.

Step 2: Remove the fuse box cover. The under-dash fuse box is located near the driver's left knee area, just above the foot rest. The cover typically has a small tab or clip that you press or pull to release it. Use a flashlight to see clearly.

Step 3: Identify the relay. Inside the fuse box, you will see a mixture of fuses and relays. The fuel pump main relay is a rectangular black or gray plastic box. It is larger than the standard mini relays around it. On the 2001 Accord, this relay usually has 7 pins and is positioned near the center or left side of the fuse block.

Step 4: Check the diagram. The inside of the fuse box cover has a diagram showing the location and function of each relay. Look for a label like "Main Relay," "PGM-FI Main Relay," or "Fuel Pump Relay." If the diagram is missing or faded, the relay is typically marked with part numbers like MITSUBA RZ-0159 12V or Honda part number 39400-SM4-003.

Step 5: Remove the relay. Once you've identified the correct relay, gently rock it side to side while pulling upward to remove it from the socket. No tools are needed. Inspect the pins for corrosion or damage.

How to Test the Fuel Pump Relay

You don't need to be an electrician to test this relay. Here are three simple methods.

Method 1: The Swap Test. Find another relay in the same fuse box that has the same shape and pin configuration. Common candidates include the horn relay, A/C clutch relay, or radiator fan relay. Swap your suspected fuel pump relay with one of those. If the fuel pump now works but the horn or A/C stops, your original relay is bad.

Method 2: Listen for the Pump. With the relay installed, turn the ignition to the ON position (do not crank the engine). Have a helper listen near the rear of the car, or put your ear close to the rear seat area. If you hear a 2-3 second whirring sound, the relay is likely working. If you hear nothing, suspect the relay or fuse.

Method 3: Multimeter Test. This is the most definitive test. Remove the relay and set your multimeter to measure ohms (resistance). Probe pins 85 and 86 (the coil terminals) – you should see some resistance, typically between 50 and 120 ohms. Then, with the relay removed, apply 12V battery power to pins 85 and 86 (observe polarity) and listen for an audible click. If no click, the relay is failed. If it clicks, check continuity between pins 30 and 87 – they should show near-zero resistance when the relay is energized.

Replacing the Fuel Pump Relay

Replacement is the easiest part of the entire process. Here's what you need to know.

Part Number: The correct OEM replacement part number for the 2001 Honda Accord fuel pump main relay is 39400-SM4-003. This relay also fits many other Honda and Acura models from the 1990s and early 2000s, including the Civic, Integra, and TL.

Where to Buy: You can find this relay at any auto parts store (O'Reilly, AutoZone, Advance Auto Parts) or online. Expect to pay between $25 and $50 for a new OEM-quality relay. Aftermarket versions are available for less, but OEM replacement quality is recommended.

Installation: Simply push the new relay into the same socket where you removed the old one. It will only go in one way due to the shape of the pins. Press firmly until it snaps into place. Reinstall the fuse box cover, and you're done. No tools, no wiring, no complicated procedures.

After replacement: Turn the key to ON and listen for the fuel pump prime. Then try starting the engine. In most cases, the car will fire right up.

What If the Relay Isn't the Problem?

If you replace the fuel pump relay and the car still won't start, don't panic. You may have a different issue. Here's what to check next.

Check the fuel pump fuse. The 2001 Accord has a dedicated fuel pump fuse, usually a 15-amp or 20-amp fuse located in the under-hood fuse box. A blown fuse will cut power to the pump entirely. Visually inspect the fuse or test it with a multimeter.

Check for voltage at the fuel pump. If the relay and fuse check out, you need to confirm that power actually reaches the fuel pump. The fuel pump is located inside the fuel tank, accessible through an access panel under the rear seat. With the key ON, use a multimeter to check for 12V at the pump connector. If voltage is present but the pump doesn't run, the pump itself is likely faulty.

Listen for the pump. If you hear a loud whining or grinding noise from the fuel tank area, the pump may be failing mechanically. A healthy pump makes a quiet, smooth whirring sound.

Consider the ECU or security system. In rare cases, the ECU itself may fail to send the signal to the relay, or an aftermarket security system may interrupt the fuel pump circuit. If you've exhausted all other options, professional diagnosis may be needed.

Preventing Future Relay Problems

The main relay in Hondas from this era is known to fail, but you can extend its life with a few simple practices.

Park in the shade. Heat is the number one enemy of these relays. The internal solder joints expand and contract with temperature changes, eventually cracking. Keeping your car cool reduces thermal stress.

Replace proactively. If your car is approaching 20-25 years old, consider replacing the main relay as preventive maintenance. It's cheap and easy, and it can save you from being stranded.

Use OEM or high-quality aftermarket relays. Cheap no-name relays may not have the same quality solder joints or internal components. Stick with known brands or genuine Honda parts.

Frequently Asked Questions

Q: Can a bad fuel pump relay drain my battery?
A: If the relay fails in the closed (stuck-on) position, it can keep the fuel pump running constantly, eventually draining the battery. This is less common than a relay that fails open (no power), but it can happen.

Q: How long does a fuel pump relay last?
A: On Honda Accords from this era, the main relay typically lasts about 10-15 years. Heat and age gradually weaken the internal solder connections.

Q: Is the fuel pump relay the same as the main relay?
A: On the 2001 Honda Accord, yes. The PGM-FI main relay contains both the fuel pump relay and the ECU power relay in one unit. You replace the entire assembly.

Q: Will the check engine light come on if the relay is bad?
A: Not always. A failing relay may not trigger a check engine light because the ECU may not detect the issue until the engine fails to start repeatedly. However, you may see codes like P0230 (Fuel Pump Primary Circuit Malfunction) if the problem persists.

Q: Can I drive with a bad fuel pump relay?
A: No. If the relay fails, the fuel pump won't run, and the engine will not run. If it fails intermittently, the car may stall without warning, which is dangerous. Replace it as soon as possible.

Final Summary

The fuel pump relay (PGM-FI main relay) on a 2001 Honda Accord is located in the under-dash fuse box on the driver's side. It is a common failure point that causes no-start conditions, intermittent stalling, and hot-start issues. Replacing it is a simple DIY job that costs around $25-$50 and takes about 10 minutes.

If you've confirmed the relay and fuse are good but the pump still doesn't run, the fuel pump itself may need replacement. For a reliable, high-performance, lifetime-warranted replacement, choose KEMSO fuel pumps available at https://www.kemsoracing.com/.

With the right diagnosis and quality parts, your 2001 Honda Accord can keep running reliably for many more miles. Don't let a $30 relay or a worn-out fuel pump leave you stranded. Check your main relay first, and go from there.

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