Where to Find the Fuel Relay on a 2008 Honda Civic

On most 2008 Honda Civics, the fuel pump (PGM-FI) relay function is built into the under-dash fuse/relay box (often called the MICU) on the driver’s side, behind the lower dash panel; it isn’t a separate, plug-in relay you can replace. Some regional trims may list a dedicated “Fuel Pump” relay in the under-hood fuse/relay box, but North American models typically integrate this function inside the under-dash unit.

Why this matters and what you’re looking for

The fuel relay supplies power to the in-tank fuel pump for a brief prime at key-on and continuously while the engine runs. On the 2008 Civic (eighth generation), Honda consolidated the “PGM-FI main relay” into the driver’s under-dash fuse/relay box; as a result, owners often can’t find a standalone relay under the hood. Knowing the correct location helps you diagnose no-start and fuel delivery issues more efficiently.

Primary locations by configuration

Most North American 2008 Civic models (DX/LX/EX/Hybrid and many Si)

The fuel pump relay function is integrated into the under-dash fuse/relay box (MICU) to the left of the steering column. It’s mounted behind the lower dash/kick panel and above the driver’s left knee area. This relay is not serviceable separately; replacement typically involves the entire under-dash fuse/relay box if the relay itself fails.

Some regional/export trims and certain equipment packages

Depending on market, a replaceable relay labeled “FUEL PUMP,” “F/P,” or a pair of “PGM-FI MAIN” relays may be present in the under-hood fuse/relay box. The box’s plastic cover will show a diagram; if you see a relay explicitly labeled for the fuel pump, that’s your serviceable part. If you don’t see it, the function is integrated under the dash.

How to access the under-dash fuse/relay box (driver’s side)

The steps below explain how to safely reach the under-dash fuse/relay box so you can inspect fuses, verify power, or identify the integrated relay assembly.

1. Turn the ignition off and disconnect the negative battery cable for safety.
2. Slide the driver’s seat back fully and kneel at the door opening.
3. Remove the small fuse access lid at the lower left of the dash (near the hood release) to see the mini fuses.
4. For fuller access, remove the lower dash/kick panel by taking out the retaining screws/clips and gently pulling the trim forward.
5. Locate the under-dash fuse/relay box mounted above the driver’s left knee area; the integrated relay circuitry is inside this unit.

Once exposed, you can check the labeled fuses and harness connections; remember the actual fuel relay logic is internal on most models, so you won’t find a separate relay to swap here.

How to check the under-hood fuse/relay box

Use these steps to quickly confirm whether your specific car has a dedicated fuel pump relay in the engine bay and to inspect related fuses.

1. Open the hood and locate the main fuse/relay box on the driver’s side of the engine bay.
2. Remove the cover and study the underside diagram for “FUEL PUMP,” “F/P,” “PGM-FI,” or “FI MAIN.”
3. If a fuel pump relay is listed, identify its position and, if needed, swap it with an identical relay in the box for a quick test.
4. Check the fuel pump and PGM-FI fuses for continuity; replace any blown fuse with the same amperage.

If you don’t see a fuel pump relay on the diagram, your Civic uses the integrated under-dash relay design and the under-hood box will only provide fusing for the circuit.

Quick diagnostic tips

Before replacing parts, these simple checks can help you confirm whether the relay and fuel pump circuit are functioning.

• Listen for a 2–3 second pump “prime” from the fuel tank area when you turn the key to ON (II). No sound can indicate a relay, fuse, wiring, or pump issue.
• Verify battery health and main grounds; low voltage can prevent relay engagement.
• Scan for engine codes; PGM-FI issues logged by the ECM/PCM can guide diagnostics.
• Backprobe the fuel pump connector (at the tank) with a wiring diagram to confirm power during prime/run if safe and appropriate.

These checks help distinguish a failed pump from a relay or power-supply problem before you consider replacing the under-dash unit.

What to do if the relay is integrated

Owners sometimes expect to replace a standalone relay, but on many 2008 Civics the fix is different.

• Inspect and reseat under-dash connectors; intermittent contacts can mimic relay faults.
• Check all related fuses (under-dash and under-hood) and repair any corroded grounds.
• If testing confirms the internal relay isn’t commanding the pump and wiring/pump are good, plan on replacing the under-dash fuse/relay box (MICU) as an assembly.
• Some technicians add an external relay workaround, but the OEM repair is to replace the MICU for reliability and safety.

Because the relay is built into a multiplex unit, proper diagnosis prevents unnecessary parts swaps and preserves system integrity.

Safety reminder

Any work around fuel systems involves fire risk. Disconnect the battery, avoid sparks, and work in a well-ventilated area. If you’re not comfortable with electrical testing, seek a qualified technician.

Summary

For a 2008 Honda Civic, the fuel pump relay is usually not a standalone part: it’s integrated into the driver’s-side under-dash fuse/relay box (MICU). Some regional trims list a replaceable fuel pump relay in the under-hood fuse/relay box—check the cover diagram. If your model uses the integrated design, diagnose fuses, wiring, and pump operation first; if the relay logic has failed, the under-dash unit typically must be replaced as an assembly.

Where is the fuel pump relay located?

So, are you wondering how to find the fuel pump relay without a multimeter? In most vehicles, the fuel pump relay is located under the vehicle’s hood in the fuse box at the engine bay.

Where is the fuel pump relay on a 2009 Honda Civic?

It. Let’s go ahead and grab that and we gently going to wiggle and pull it straight out like. So now we’re going to go ahead and start the vehicle. And what’s left in the fuel.

How do you know if your main relay is bad on a Honda Civic?

A failing Honda Civic main relay, also known as the fuel pump relay, can cause a variety of starting and running issues. The most common symptom is a no-start condition where the engine cranks but won’t fire up. Other symptoms include start-and-stall, intermittent stalling, or poor fuel efficiency. 
Here’s a more detailed breakdown:
No-Start Condition:

• The main relay powers the fuel pump and other critical systems. If it fails, the fuel pump won’t activate, and the engine won’t get the fuel it needs to start. 
• The engine will crank, but it won’t catch or fire up. 

Start-and-Stall or Intermittent Starting: 

• A failing relay might work intermittently, causing the car to start sometimes and not others.
• It can also cause the engine to start and then immediately stall, as the relay might cut power to the fuel pump. 

Other Possible Symptoms:

• Poor fuel efficiency: A faulty relay can cause erratic fuel delivery, leading to increased fuel consumption. 
• Check engine light: A bad main relay can trigger the check engine light. 
• Engine hesitation or surging: In some cases, a failing relay can cause the engine to hesitate or surge while driving, especially at lower speeds. 

Troubleshooting:

1. Listen for the fuel pump: When you turn the ignition key to the “on” position, listen for a brief whirring sound from the fuel pump, which is a good sign that the relay is functioning. 
2. Check the relay visually: Look for signs of damage, such as burnt or cracked solder joints. 
3. Test the relay: You can test the relay using a multimeter to check for continuity or by swapping it with a known good relay (if available). 
4. Consider professional help: If you’re unsure about testing or replacing the relay, consult a mechanic. 

Important Note: In many older Honda models, a faulty main relay is a common problem, and it’s often misdiagnosed as a fuel pump issue. So, if you’re experiencing a no-start or other related symptoms, checking the main relay should be one of your first troubleshooting steps.

How do I know if the fuel relay is bad?

In this case the engine will crank. But it won’t start or it might require a few attempts. If it does eventually. Start you’ll have other more challenging symptoms to navigate.