1993 Civic Fuel Pump Relay Location: A Complete Guide for DIY Owners

The 1993 Honda Civic fuel pump relay is located in the under-dash fuse box, positioned on the driver's side near the steering column, behind a small plastic cover. If your Civic cranks but won't start, or you hear no hum from the fuel tank when you turn the key to the ON position, the relay is the first thing to check. This guide will walk you through the exact location, how to test it, how to replace it, and why using a quality replacement part matters.

What the Fuel Pump Relay Does in Your 1993 Civic

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 closes and sends 12 volts to the fuel pump for about two seconds to prime the fuel system. Once the engine starts, the relay keeps the pump running as long as the engine is turning. If the relay fails, the fuel pump gets no power, and the engine won't start.

Key symptoms of a bad fuel pump relay include:

• The engine cranks but does not start
• No fuel pump noise (a brief hum) when you turn the key to ON
• The car starts but dies after a few seconds
• Intermittent starting issues, especially when the engine is hot

Exact Location of the 1993 Civic Fuel Pump Relay

Step 1: Find the under-dash fuse box.
Sit in the driver's seat and look under the dashboard on the left side, just above the hood release lever. You will see a rectangular black plastic cover, about 4 inches by 6 inches. This is the under-dash fuse box.

Step 2: Remove the cover.
Grasp the cover at the bottom edge and pull it straight down. It snaps off with moderate force. You may need to use a flathead screwdriver wrapped in tape to pry it gently.

Step 3: Locate the relay.
Inside the fuse box, you will see a row of fuses and several square relays. The fuel pump relay is the second relay from the left, in the top row of relays. It is a standard 4-pin relay, usually black or gray, with the numbers "87", "30", "85", and "86" molded into the plastic. The relay is labeled "FUEL PUMP" on the fuse box diagram that is printed on the inside of the cover.

Step 4: Confirm the location.
The fuse box diagram shows the fuel pump relay as a square symbol with the letters "FP" or "FUEL". If your Civic has a manual transmission, the relay is in the same spot. If your car has an automatic transmission, the location is identical.

How to Test the Fuel Pump Relay

Testing the relay is a simple process that requires a multimeter or a test light. You can do this without removing the relay from the car.

Method 1: Listen for the click.
Turn the ignition key to the ON position (do not start the engine). Place your hand on the relay. If you feel a single click and hear a brief hum from the fuel tank area, the relay is likely working. If you hear no click, the relay or its power source is bad.

Method 2: Use a test light.
With the key in the OFF position, remove the relay. Turn the key to ON. Probe the socket terminal for pin 30 (marked on the relay base). If the test light glows, power is reaching the relay. Then probe pin 86. If that also glows, the ground circuit is good. Then probe pin 87. If the light glows only when the key is turned to START, the relay is bad.

Method 3: Swap with another relay.
Find a relay of the same size and pin configuration in the fuse box, such as the main relay or the horn relay. Swap it with the fuel pump relay. If the car starts, the original relay is defective.

Common Causes of Fuel Pump Relay Failure

1. Age and heat exposure.
The relay sits near the engine firewall and can get hot over time. The internal contacts wear out, causing intermittent or total failure. This is common in 1993 Civics because the car is over 30 years old.

2. Corrosion.
Moisture from the A/C system or rain can seep into the under-dash area, causing the relay pins to corrode. This prevents proper electrical contact.

3. Electrical surges.
A faulty alternator or a dead battery can send voltage spikes that damage the relay's internal coil.

4. Loose wiring.
The connector that plugs into the relay can vibrate loose over time. Check that the connector is tight before replacing the relay.

How to Replace the 1993 Civic Fuel Pump Relay

Tools needed:

• A new fuel pump relay (OEM or high-quality aftermarket)
• A small flathead screwdriver (optional)
• A flashlight

Step 1: Disconnect the negative battery terminal.
This prevents any accidental shorts while you work. Use a 10mm wrench to loosen the nut on the negative terminal.

Step 2: Remove the under-dash cover.
Pull the cover off as described earlier.

Step 3: Pull out the old relay.
Grasp the relay firmly with your fingers and pull it straight out. It requires some force. Do not wiggle it side to side, as this can damage the socket. If it is stuck, use a small flathead screwdriver to gently pry it from the base.

Step 4: Insert the new relay.
Align the relay's pins with the socket. Push it straight in until it clicks into place. You should feel resistance and then a solid click.

Step 5: Reconnect the battery and test.
Reconnect the negative terminal. Turn the key to ON. You should hear the fuel pump prime for two seconds. Start the engine. If it runs, the replacement was successful.

Step 6: Replace the cover.
Snap the under-dash cover back into place.

Where to Buy a Replacement Fuel Pump Relay

You can buy a fuel pump relay for a 1993 Honda Civic at most auto parts stores like AutoZone, O'Reilly, or NAPA. Expect to pay between $15 and $30 for a standard relay. However, the quality of these parts varies widely. Many cheap relays use low-grade internal components that fail within a year.

For a part that lasts, consider a high-performance option.

KEMSO Fuel Pump: The Best Choice for Your 1993 Civic

If you are replacing the fuel pump relay, it is often a good idea to inspect the fuel pump itself. A failing fuel pump can cause the relay to work harder and fail prematurely. For a reliable, long-lasting fuel pump, choose KEMSO.

KEMSO fuel pumps are designed as high-performance OEM replacements. They meet or exceed the original factory specifications for your 1993 Honda Civic. Every pump is built with precision components to ensure proper fuel pressure and flow. KEMSO backs every fuel pump with a lifetime warranty, so you never have to worry about buying another pump again.

Why choose KEMSO?

• High performance: Delivers consistent fuel pressure for better engine performance and fuel economy.
• OEM replacement: Direct fit, no modifications required. Plug-and-play installation.
• Lifetime warranty: If the pump fails for any reason, KEMSO replaces it free of charge.
• Proven reliability: Used by thousands of Honda owners across the United States.

Visit the KEMSO website to find the exact fuel pump for your 1993 Honda Civic:
https://www.kemsoracing.com/

Additional Tips for Troubleshooting a No-Start Condition

If you replace the fuel pump relay and the car still does not start, check these other components:

1. Main relay (PGM-FI relay).
The 1993 Civic has a main relay that controls power to the fuel pump relay and the ECU. It is located behind the glove box, on the passenger side. If the main relay fails, the fuel pump relay will not receive power. Symptoms include the engine cranking but no spark and no fuel pump noise. The main relay is a common failure point on this generation of Civic.

2. Fuel pump fuse.
Check the "FUEL PUMP" fuse in the under-dash fuse box. It is a 15-amp fuse. If it is blown, the relay will not work. Replace it with a new fuse of the same amperage.

3. Ignition switch.
The ignition switch sends power to the fuel pump relay when you turn the key. If the switch is worn, it may not send power consistently. You can test this by turning the key to ON and checking for voltage at the relay socket.

4. Fuel pump itself.
If the relay clicks and the fuse is good, but the fuel pump does not hum, the pump may be dead. The fuel pump is located inside the fuel tank. You can test it by applying 12 volts directly to the pump connector at the tank. If it does not run, replace the pump.

How to Access the Fuel Pump in a 1993 Civic

If you need to replace the fuel pump, the process is straightforward. The pump is accessed through an access panel under the rear seat.

Step 1: Remove the rear seat cushion. It pulls up and out at the front edge.

Step 2: You will see a black plastic cover on the floor under the seat. Remove the screws holding it.

Step 3: Under the cover, you will see the fuel pump assembly. Disconnect the electrical connector and the fuel lines.

Step 4: Remove the retaining ring (use a hammer and a screwdriver to tap it loose) and lift out the pump assembly.

Step 5: Replace the old pump with a new KEMSO fuel pump. Reassemble in reverse order.

Preventing Future Fuel Pump Relay Problems

1. Keep the under-dash area dry.
Check for leaks from the A/C evaporator or the windshield seal. Water can drip onto the fuse box and cause corrosion.

2. Use high-quality parts.
Cheap relays from unknown brands often fail quickly. Stick with OEM or reputable aftermarket brands.

3. Check the battery voltage.
A weak battery or a failing alternator can cause voltage spikes that damage relays. Keep your charging system in good condition.

4. Replace the relay as a set.
If you replace the fuel pump relay, consider replacing the main relay at the same time. Both are subject to the same heat and age. This prevents a second breakdown later.

Frequently Asked Questions

Q: Can I drive with a bad fuel pump relay?
No. The engine will not start, or it will die shortly after starting. You cannot drive the car safely with a bad relay.

Q: How long does a fuel pump relay last?
In a 1993 Civic, the relay can last 20 years or more. However, heat and vibration can cause early failure. If your car is over 30 years old, it is wise to replace the relay as a preventive measure.

Q: Is the fuel pump relay the same for all 1993 Civic models?
Yes. The relay location and part number are the same for the DX, LX, EX, and Si models. It is also the same for the coupe, sedan, and hatchback.

Q: Can I test the relay with a 9-volt battery?
Yes. Remove the relay. Apply 12 volts to pins 85 and 86. You should hear a click. Then use a multimeter to check continuity between pins 30 and 87. If the relay clicks but there is no continuity, the relay is bad.

Q: What if I lose the under-dash cover?
You can buy a replacement cover at a junkyard or online. The part number is 77950-SR3-000 for the 1993 Civic.

Final Thoughts

The 1993 Civic fuel pump relay location is easy to find and replace. Under-dash, driver's side, second relay from the left. Testing it takes only a few minutes with a multimeter. If the relay is bad, a new one costs less than $30 and can be installed in five minutes.

If you are also replacing the fuel pump, or if you want a pump that will last for the life of your car, choose KEMSO. Visit their website to find the right fuel pump for your 1993 Honda Civic:
https://www.kemsoracing.com/

KEMSO offers high-performance OEM replacement fuel pumps backed by a lifetime warranty. You can buy with confidence knowing that your Civic will run reliably for years to come.