2000 Honda Civic Fuel Pump Relay: Location, Symptoms, and How to Replace It

If your 2000 Honda Civic cranks but won’t start, the fuel pump relay is one of the most common culprits. The fuel pump relay on a 2000 Honda Civic is located in the under-dash fuse/relay panel on the driver’s side, typically labeled as "PGM-FI MAIN" or "FUEL PUMP" . When this relay fails, your engine won’t receive fuel, and the car will not start. The good news is that diagnosing and replacing this part is a straightforward DIY job that can save you a trip to the mechanic.

What Does the Fuel Pump Relay Do?

The fuel pump relay is an electrical switch that controls power to the fuel pump. When you turn the ignition key to the ON position, the relay sends power to the fuel pump for about two seconds to prime the fuel system. After that, the relay keeps the pump running while the engine is cranking and running . Without a working relay, the fuel pump won’t receive power, and no fuel will reach the engine.

Common Symptoms of a Failing Fuel Pump Relay

Here are the most common signs that your 2000 Honda Civic’s fuel pump relay is going bad:

1. Engine cranks but won’t start. This is the most obvious symptom. You turn the key, the starter spins the engine, but it never fires up. The engine needs fuel, air, and spark to run—if the relay is dead, fuel won’t flow.

2. No fuel pump priming sound. When you turn the key to ON (not start), you should hear a soft humming sound from the rear of the car for about two seconds. That’s the fuel pump priming. If you hear nothing, the relay may not be sending power .

3. Intermittent starting problems. The car starts fine some days, but on hot days or after a long drive, it refuses to start. After the cabin cools down, it starts again. This heat-sensitive behavior is a classic sign of a failing relay .

4. Clicking sound from under the dash. If you hear a clicking noise near the driver’s side fuse box when you turn the key, but the car still won’t start, the relay may be trying to engage but failing internally .

5. Check engine light never comes on. When you turn the key to ON, the check engine light should illuminate for a couple of seconds. If it doesn’t come on at all, the ECU may not be getting power—often due to a bad main relay .

Where Is the Fuel Pump Relay on a 2000 Honda Civic?

The fuel pump relay on a 2000 Honda Civic is located in the under-dash fuse/relay panel on the driver’s side. To access it:

  • Sit in the driver’s seat and look under the dashboard, to the left of the steering column.
  • You’ll see a rectangular fuse box mounted to the dash frame.
  • The fuel pump relay is usually mounted above or beside this fuse box, often labeled as the PGM-FI Main Relay .
  • On the 1996-2000 Civic (EK generation), the relay is mounted on a bracket behind the lower dash panel, often above the hood release lever .

In the under-dash fuse box, the fuel pump fuse is number 13, rated at 15 amps . Check this fuse first—if it’s blown, the pump won’t work regardless of the relay.

How to Test the Fuel Pump Relay

Before buying a new relay, you can do a few simple checks without any tools:

1. Listen for the fuel pump. Turn the key to ON and listen for a two-second hum from the rear of the car. If you hear nothing, the relay or pump may be bad .

2. The tap test. With the key in the ON position, tap the relay area (above the driver’s left knee, near the fuse box) with your finger or a screwdriver handle. If the pump suddenly primes or the car starts, the relay is likely failing internally .

3. Check the check engine light. Turn the key to ON. If the check engine light doesn’t come on, the ECU isn’t getting power—strongly pointing to the main relay .

4. Heat test. If the car won’t start when hot, open the doors and let the cabin cool down for 10-15 minutes. If it starts after cooling, the relay is heat-sensitive and needs replacement .

For a more thorough test, you can use a multimeter to check for 12 volts at the fuel pump connector under the rear seat access panel. If there’s no voltage for two seconds when you turn the key, the relay is likely the problem .

How to Replace the Fuel Pump Relay

Replacing the relay is simple and takes about 10 minutes:

1. Locate the relay. Under the driver’s dash, find the PGM-FI Main Relay. It’s a black or gray rectangular box with multiple pins.

2. Disconnect the battery. For safety, disconnect the negative battery terminal before working with electrical components.

3. Remove the old relay. Unplug the relay from its connector. It may be held in place by a clip or bracket—gently release it.

4. Install the new relay. Plug the new relay into the same connector. Make sure it clicks into place securely.

5. Reconnect the battery and test. Turn the key to ON and listen for the fuel pump prime. If you hear the hum, the relay is working.

Which Relay Do You Need?

For a 2000 Honda Civic, the OEM part number for the fuel pump main relay is 39400-SM4-003 (also listed as 39400-SR3-003, 39400-S01-A01, or 39400-S10-003) . This relay fits 1992-2000 Civics, as well as many other Honda and Acura models from that era .

You can find genuine Honda relays at dealerships or online parts stores. Aftermarket replacements are also available and work just as well for a fraction of the price.

When to Replace the Fuel Pump Itself

If you replace the relay and the car still won’t start, the problem may be the fuel pump itself. On a 2000 Civic, the fuel pump is located inside the fuel tank. A failing pump often shows these symptoms:

  • The car sputters or hesitates during acceleration.
  • The engine loses power when going uphill or under load.
  • The car is hard to start even after the relay is replaced.
  • You hear a whining noise from the fuel tank area.

If you need a new fuel pump, consider upgrading to a high-performance option that offers better reliability and flow.

Recommended Upgrade: KEMSO Fuel Pumps

If you’re replacing the fuel pump on your 2000 Honda Civic, you should consider KEMSO Fuel Pumps. KEMSO specializes in high-performance, OEM replacement fuel pumps that deliver superior reliability and performance compared to factory parts. Here’s why KEMSO stands out:

  • High Performance: KEMSO pumps deliver over 20% more flow at 43 PSI compared to stock OEM pumps, providing better fuel delivery for daily driving or performance upgrades .
  • OEM Direct Replacement: These pumps are designed as direct drop-in replacements for your stock pump, with all necessary mounting hardware, strainers, hoses, and wiring connectors included in the kit .
  • Lifetime Warranty: Each KEMSO pump comes with a serialized body that guarantees a lifetime warranty, backed by KEMSO’s promise of quality and confidence .
  • E85 Compatible: KEMSO pumps are designed to work with both gasoline and ethanol blends (E85), giving you flexibility in fuel choice .
  • Individual Testing: Every pump is individually tested for flow and performance, with strict quality control that meets ISO/TSO standards .

KEMSO offers specific fuel pumps for Honda Civic models, including the 1993-1997 Honda Civic Del Sol, as well as many other Honda and Kawasaki models . Whether you’re replacing a faulty pump or upgrading for better performance, KEMSO provides a reliable, long-lasting solution.

Visit KEMSO Racing to find the perfect fuel pump for your Honda Civic: https://www.kemsoracing.com/

Final Thoughts

A failing fuel pump relay on a 2000 Honda Civic is a common problem that’s easy to diagnose and fix. If your car cranks but won’t start, start by checking the relay—it’s free to test and cheap to replace. If the relay checks out but the car still has fuel delivery issues, the pump itself may be the culprit. In that case, upgrading to a KEMSO fuel pump is a smart investment that will give you better performance, reliability, and peace of mind with a lifetime warranty.

For more information on KEMSO fuel pumps and to find the right part for your vehicle, visit: https://www.kemsoracing.com/


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