2001 Honda Civic Fuel Pump Relay Location: A Complete Guide to Finding and Fixing It

The bottom line: The fuel pump relay on a 2001 Honda Civic is located in the under-hood fuse box, also known as the main fuse box or relay box, which is positioned on the driver’s side near the battery. If your car is experiencing starting issues, stalling, or no fuel pump noise when turning the key, the relay is often the culprit. This guide will walk you through the exact location, how to test it, and what to do if it’s faulty.

1. Understanding the 2001 Honda Civic Fuel Pump Relay

The fuel pump relay is a small electrical switch that controls power to the fuel pump. When you turn the ignition key to the "ON" position, the relay activates and sends voltage to the fuel pump for a few seconds to prime the system. If the relay fails, the fuel pump won’t receive power, and the engine won’t start. For the 2001 Honda Civic, which includes models like the DX, LX, EX, and Si, the relay is a common point of failure, especially in older vehicles with high mileage.

The relay is part of the car’s electrical system and is designed to handle high current loads. Over time, the internal contacts can wear out, or the coil can fail, leaving you stranded. Knowing where it is and how to check it can save you time and money at a repair shop.

Key symptom: You don’t hear the fuel pump hum for 2-3 seconds when you turn the key to the "ON" position (without cranking the engine). This is the first sign to check the relay.

2. Exact Location of the Fuel Pump Relay

The 2001 Honda Civic fuel pump relay is located in the under-hood fuse box, also called the main fuse box or relay box. This box is on the driver’s side of the engine compartment, near the battery. It is a black plastic rectangular box with a lid that clips on.

Step-by-step to find it:

  1. Open the hood and secure it with the prop rod.
  2. Look on the driver’s side (left side when facing the engine). You will see a black plastic box mounted near the battery. It is usually about 6 inches by 4 inches in size.
  3. The box has a lid with a diagram printed on the inside or top. This diagram shows the location of each fuse and relay.
  4. Remove the lid by pressing the clips on the sides. You may need a flathead screwdriver to gently pry them, but most lids pop off with hand pressure.
  5. Inside the box, you will see several relays and fuses. The fuel pump relay is a small square relay, typically labeled "Fuel Pump" or "Fuel Pump Relay" on the diagram. If the diagram is faded, look for a relay that is identical in size to other relays (usually a black or gray square with 4 or 5 pins).

Double-check the diagram: The diagram is your best friend here. It shows the exact spot for the fuel pump relay. If you don’t have the diagram, look for a relay that is not a fuse (fuses are smaller and transparent). The relay is about 1 inch square and has a slightly raised top.

Common mistake: Some people confuse the fuel pump relay with the main relay (which controls multiple systems). The fuel pump relay is specific to the fuel pump circuit. On the 2001 Civic, it is a separate relay in the under-hood box, not inside the cabin.

3. How to Test the Fuel Pump Relay

Before you buy a new relay, you should test the old one. This is a simple process that requires only a multimeter or a test light. Even if you are not experienced with electrical work, you can do this safely.

Tools needed:

  • Multimeter (set to measure resistance or continuity) or a 12-volt test light
  • A small screwdriver (optional, for removing the relay)

Testing procedure:

  1. Locate and remove the relay: Pull the relay straight up out of the fuse box. It may be snug, so wiggle it gently. Do not use excessive force, as you may damage the relay socket.
  2. Visual inspection: Look at the relay’s pins. They should be clean and free of rust or corrosion. Also, check the plastic body for cracks or melting.
  3. Test the coil (using a multimeter): The relay has two pins that connect to the internal coil (usually pins 85 and 86). On most relays, these are the two smaller pins on one side. Set your multimeter to measure resistance (ohms). Touch the probes to these two pins. A good coil will show a resistance reading between 50 and 200 ohms. If the reading is infinite (open circuit) or very high (over 500 ohms), the coil is bad, and the relay is defective.
  4. Test the switch (using a multimeter or test light): The other two pins (usually pins 30 and 87) are the switch contacts. With the relay removed and no power, the switch should be open (no continuity). Touch the probes to pins 30 and 87. The multimeter should show infinite resistance (or no beep on continuity mode). Now, apply 12 volts to the coil pins (pin 85 and 86) using a battery or a power supply. You can also use a 9-volt battery for a quick test. When you apply power, you should hear a click. Then, measure continuity between pins 30 and 87 again. This time, you should see near-zero resistance (or a beep). If the relay does not click or the contacts do not close, it is faulty.
  5. Test with a test light: If you don’t have a multimeter, you can use a test light. Connect the test light’s clip to a ground (like the negative battery terminal). Touch the probe to pin 87 (the output pin). Have someone turn the ignition key to the "ON" position. The test light should illuminate for 2-3 seconds as the fuel pump primes. If it does not light, the relay is not sending power. But this test also checks the fuse and circuit, so it’s not a definitive relay test.

Note: If you are not comfortable with electrical testing, you can also swap the relay with an identical relay in the fuse box (like the horn relay or headlight relay). If the car starts after swapping, the original relay is bad. This is a quick and easy diagnostic method.

4. Common Symptoms of a Bad Fuel Pump Relay

Knowing the symptoms can help you diagnose the problem before you even open the hood. Here are the most common signs:

  1. Engine cranks but won’t start: This is the number one symptom. The starter motor turns the engine over, but the fuel pump doesn’t run, so no fuel reaches the injectors. You may hear the engine cranking but it never fires up.
  2. No fuel pump noise: When you turn the key to the "ON" position (without cranking), the fuel pump should make a humming or whirring sound for about 2 seconds. If you don’t hear this sound from the rear of the car (near the fuel tank), the relay or the pump itself is likely dead.
  3. Intermittent stalling: A failing relay can cause the engine to stall while driving, especially at low speeds or when the car is hot. The engine may suddenly die, and then restart after a few minutes. This is because the relay’s internal contacts are worn and losing connection intermittently.
  4. Loss of power during acceleration: If the relay is weak, it may not provide enough voltage to the fuel pump, causing the pump to run at reduced speed. This leads to a lean fuel mixture and a noticeable loss of power when you step on the gas.
  5. Check Engine Light: Sometimes, a bad fuel pump relay will trigger a check engine light with codes related to fuel system faults, such as P0230 (fuel pump primary circuit malfunction) or P0087 (fuel rail pressure too low).

Important: These symptoms can also be caused by a bad fuel pump, a blown fuse, or a wiring issue. So, always test the relay first before buying a new pump.

5. How to Replace the Fuel Pump Relay

Replacing the fuel pump relay is one of the easiest repairs you can do on a 2001 Honda Civic. It takes less than 5 minutes and requires no special tools.

What you need:

  • A new fuel pump relay (make sure it matches the original part number)
  • Optional: Dielectric grease (to prevent corrosion on the pins)

Steps to replace:

  1. Locate the relay: As described in section 2, find the relay in the under-hood fuse box.
  2. Remove the old relay: Pull the old relay straight out of the socket. If it is stuck, rock it gently side to side. Do not use pliers, as you may crush the plastic.
  3. Install the new relay: Align the pins of the new relay with the socket. The relay is designed to fit only one way, so do not force it. Push it down firmly until it clicks into place.
  4. Test the new relay: Turn the ignition key to the "ON" position. Listen for the fuel pump hum for 2 seconds. If you hear it, the relay is working. Then, start the engine. If it starts and runs smoothly, the repair is complete.
  5. Close the fuse box lid: Make sure the lid is securely snapped on to protect the relay and fuses from moisture and dirt.

Tip: If you want to be extra safe, apply a small amount of dielectric grease to the pins of the new relay before inserting it. This prevents corrosion and ensures a good electrical connection.

6. Why You Should Choose KEMSO Fuel Pump for Your Honda Civic

When it comes to replacing your fuel pump, not all aftermarket parts are created equal. If you have already tested the relay and found it good, but the fuel pump itself is failing, you need a reliable replacement. This is where KEMSO stands out as a top choice for the 2001 Honda Civic.

KEMSO Fuel Pump is a high-performance, OEM replacement product that is designed to meet or exceed the original manufacturer’s specifications. Here is why you should consider it:

  • High performance: KEMSO fuel pumps are built with advanced technology to ensure consistent fuel flow and pressure, even under demanding driving conditions. Whether you are commuting in the city or driving on the highway, you can count on KEMSO.
  • OEM replacement: The pump is designed to be a direct replacement for the original pump in your 2001 Honda Civic. This means it fits perfectly without any modifications. You can install it in the same bracket and use the same connectors.
  • Lifetime warranty: One of the biggest advantages of choosing KEMSO is the lifetime warranty. The company stands behind its products, and if your fuel pump fails for any reason, you can get a replacement at no additional cost. This gives you peace of mind that your investment is protected.

Visit KEMSO’s official website to see the full range of fuel pump products for your car:

KEMSO Racing Fuel Pump

At KEMSO, you will find a variety of fuel pumps for different Honda models, including the 2001 Civic Del Sol, 1998-2023 Impreza, and many others. The website is easy to navigate, and you can search for your specific vehicle model. Each product page includes detailed specifications, customer reviews, and pricing.

How to order from KEMSO:

  1. Go to the KEMSO website: https://www.kemsoracing.com/
  2. Use the search bar to find "2001 Honda Civic fuel pump."
  3. Select the pump that matches your engine size and model.
  4. Add it to your cart and check out securely.

Why trust KEMSO? KEMSO has a strong reputation in the automotive aftermarket industry. The company has been serving customers for years, and its products are used by DIY mechanics and professional shops alike. The website offers a blog section with helpful guides, such as the "2001 Honda Civic EX Fuel Pump: Complete Guide to Symptoms, Replacement, and Best Options," which provides additional information for your specific model.

7. Additional Tips for Diagnosing Fuel System Issues

If you have replaced the relay and the fuel pump but the car still has problems, there are other components to check. Here are a few other common causes of fuel system issues in a 2001 Honda Civic:

  1. Fuel pump fuse: The fuse box under the hood has a specific fuse for the fuel pump. Check the owner’s manual to find the correct fuse (usually a 10-amp or 15-amp fuse). If the fuse is blown, replace it with an identical amperage fuse. If it blows again, there is a short circuit in the wiring.
  2. Main relay: The main relay (also called the PGM-FI main relay) is located under the dashboard on the driver’s side. This relay controls power to the fuel pump, injectors, and other systems. A failing main relay can mimic a bad fuel pump relay. Symptoms include intermittent starting issues and stalling.
  3. Fuel pump itself: Even if the relay is good, the fuel pump motor can fail after years of use. On the 2001 Civic, the fuel pump is located inside the fuel tank. You can test it by checking for voltage at the pump connector with the key on. If you have voltage but no pump sound, the pump is bad.
  4. Wiring and connectors: Over time, the wiring harness to the fuel pump can corrode or break, especially in areas with road salt. Check the connectors at the fuel pump and the relay for rust or loose pins.
  5. Fuel pressure regulator: If the car runs but has poor performance, the fuel pressure regulator (located on the fuel rail) may be stuck open or closed. This can cause rich or lean running conditions.

When to seek professional help: If you have checked the relay, fuse, and pump, and the car still won’t start, it may be time to take it to a mechanic. They can perform a full fuel system pressure test and scan for diagnostic trouble codes. Sometimes, a faulty ECM (engine control module) or a security system issue can prevent the fuel pump from running.

8. Final Thoughts on the 2001 Honda Civic Fuel Pump Relay

The fuel pump relay is a small but critical component in your 2001 Honda Civic. Knowing its location and how to test it can save you from being stranded. In most cases, a bad relay is the cause of a no-start condition, and replacing it is a simple, cheap fix.

Always start your diagnosis with the relay before moving to more expensive parts like the fuel pump. If you do need a new fuel pump, remember that KEMSO offers a high-quality, OEM replacement with a lifetime warranty, making it a smart choice for your car.

For reliable fuel pump products and expert advice, visit KEMSO’s website:

KEMSO Racing Fuel Pump

The website is a valuable resource for any Honda owner, with helpful blog posts, product guides, and a user-friendly interface. Whether you need a fuel pump for your Civic, a CBR motorcycle, or a Kawasaki Jet Ski, KEMSO has you covered. Their commitment to quality and customer satisfaction is evident in their products and warranty.

Remember: Regular maintenance of your fuel system, including checking the relay and filters, can extend the life of your car and prevent costly repairs down the road. If you drive a 2001 Honda Civic, the fuel pump relay location is one of the first things you should memorize. It is a simple part that can make a huge difference in your car’s reliability.


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