1997 Honda Accord Fuel Pump Relay Location: Find It, Test It, and Fix It Yourself
The fuel pump relay on your 1997 Honda Accord is located under the driver's side dashboard, to the left of the steering column, mounted behind the power steering control box. If your Accord cranks but won't start, especially in hot weather, start your diagnosis here before replacing the fuel pump. Replacing this relay is a 30-minute DIY job that costs $20 to $40, while misdiagnosing it as a bad fuel pump can cost you $200 to $600 in unnecessary repairs .
Important: If you hear the fuel pump prime (a faint whirring sound from the rear of the car for about 2 seconds when you turn the key to ON) but the car still won't start, the relay is likely not the problem. The relay controls power to the fuel pump – if the pump primes, the relay is working .
Why the Fuel Pump Relay Matters
The fuel pump relay is the electrical switch that sends 12 volts of power to the fuel pump when you turn the ignition key. It's part of the PGM-FI main relay system on your 1997 Accord. When the relay fails, the fuel pump doesn't run, and the engine won't start even if every other system is perfect .
Many Honda owners waste money replacing a perfectly good fuel pump when the real problem is the relay. A new fuel pump for a 1997 Honda Accord costs $100 to $200, plus $200 to $400 in labor to drop the fuel tank. In contrast, a new fuel pump relay costs $20 to $40 and takes less than 30 minutes to install .
Symptoms of a Bad Fuel Pump Relay on Your 1997 Accord
1. Engine cranks but won't start (no fuel pressure)
The most common symptom. If the relay isn't sending power to the pump, no fuel reaches the injectors, and the engine won't fire .
2. Intermittent starting problems that are worse in hot weather
Heat-related relay failure is very common in Honda Accords. The relay's internal solder joints crack over time, and heat expansion makes the connection worse. After the car cools down for 20 to 30 minutes, the relay may work again .
3. No fuel pump priming sound
When you turn the key to the ON position (without cranking), you should hear a brief humming sound from the rear of the car for about 2 seconds. If you don't hear it, the relay may not be sending power to the pump .
4. Engine stalls while driving and then restarts after cooling
The relay may fail intermittently while you're driving, causing the engine to lose power and stall. It often restarts once the relay cools down .
How to Confirm the Fuel Pump Relay Is Bad
Test 1: Listen for the Fuel Pump Prime
Turn the key to the ON position. Listen near the rear seat or trunk area. If you hear a 2-second whirring sound, the relay is working. If you don't hear anything, proceed to the next test .
Test 2: Swap the Relay
This is the quickest diagnostic test. Locate the under-dash fuse box (driver's side, left of steering column). Find another relay of the same type and rating – the horn relay or A/C relay are good candidates. Swap it into the fuel pump relay socket. If the car starts, you've confirmed the original relay was bad .
Important: The 1997 Accord fuel pump relay is a 7-pin unit. Make sure the relay you swap with has the same pin configuration .
Test 3: Check for Power at the Fuel Pump
Open the trunk and locate the fuel pump access panel (under the carpet and plywood cover above the spare tire). With the ignition ON, use a multimeter to check for 12 volts at the fuel pump connector. If you have voltage and the pump doesn't run, the pump itself is bad. If you have no voltage, the issue is upstream – likely the relay, fuse, or wiring .
Test 4: Check the Fuse First
Before blaming the relay, check the 15-amp fuse in the passenger compartment fuse box that powers the PGM-FI main relay. This fuse is usually labeled as number 3 in the fuse box diagram. If it's blown, replace it with a new one of the same rating. If it blows again, you have a short circuit elsewhere .
Step-by-Step Guide to Replace the Fuel Pump Relay on a 1997 Honda Accord
Step 1: Disconnect the Battery
Safety first. Disconnect the negative battery cable to avoid any electrical shorts. Note your radio code if applicable, as disconnecting the battery may reset the radio .
Step 2: Access the Relay
Remove the lower dash panel on the driver's side. You may need a 10mm socket with an 8-inch extension to remove brackets that block access. The relay is mounted to the left of the steering column, often behind the power steering control box .
Step 3: Remove the Old Relay
Use a small flat-blade screwdriver to gently pry the relay loose from its mounting bracket. Carefully separate the wire harness connector from the relay. Some relays have a mounting bolt that needs to be removed .
Step 4: Inspect the Socket
Before installing the new relay, inspect the socket for any signs of corrosion, melted plastic, or bent terminals. If you see damage, it may indicate a larger electrical issue that needs professional attention .
Step 5: Install the New Relay
Plug the new relay into the wire harness connector and mount it in the same position. Ensure it clicks securely into place. The relay should be a 7-pin unit with the OEM part number 39400-SM4-003 or equivalent .
Step 6: Reassemble and Test
Reconnect the negative battery cable, enter your radio code if needed, and test the car. Turn the key to ON and listen for the fuel pump priming sound. Then try to start the engine. The entire job should take less than 30 minutes .
OEM Part Number and Compatible Replacements
The original fuel pump relay for the 1997 Honda Accord has the OEM part number 39400-SM4-003. Other compatible part numbers include 39400-SV4-003, 39400-SR3-003, 39400-SL5-A01, RZ-0088, RZ-0159, and RY169. This relay fits 1990-1997 Honda Accord models and many other Honda and Acura vehicles from that era .
Can You Repair the Old Relay Instead of Replacing It?
Yes, many Honda owners choose to re-solder the relay instead of replacing it. The relay is easy to open with a small flathead screwdriver. Inside, you'll see a small circuit board with several solder joints. Use a soldering iron to reflow every joint, especially the larger ones that carry the fuel pump and ECU power circuits. This fixes the cracked solder joints and usually solves the problem for another 10 years .
Note: The replacement part you buy from Honda will have the same design defect, so eventually you'll have to do this again. Re-soldering can be a permanent fix .
When to Suspect the Fuel Pump Instead of the Relay
While the relay is the most common cause of no-start issues on the 1997 Honda Accord, there are times when the fuel pump is the real culprit. Suspect the fuel pump if:
- The problem is constant (it never starts, regardless of temperature)
- You have voltage at the fuel pump connector but the pump doesn't run
- The fuel pump is noisy or makes unusual sounds
- You've already replaced the relay and the problem persists
If your car exhibits intermittent starting problems, especially in hot weather, start with the relay. If the problem is constant, suspect the fuel pump itself .
How to Test the Relay with a Multimeter
For a definitive test, remove the relay and use a multimeter:
Test the Coil: Set your multimeter to measure resistance (ohms). Touch the probes to pins 85 and 86 (the coil terminals). You should get a reading between 50-100 ohms. If you get an open circuit (OL) or very high resistance, the coil is bad .
Test the Switch: With the multimeter still on resistance mode, touch probes to pins 30 and 87 (the switch terminals). You should read an open circuit (no continuity) when the relay is de-energized .
Apply 12 Volts: Connect 12 volts from a battery to pins 85 and 86. You should hear a distinct click as the relay activates. While 12V is applied, test continuity between pins 30 and 87. You should now read near zero ohms (continuity), indicating the switch has closed. If not, the switch is faulty .
Common Causes of Fuel Pump Relay Failure in Honda Accords
1. Heat degradation
The relay is located near the engine bay, where temperatures can soar. Prolonged exposure to high heat degrades the plastic housing and internal components, leading to cracked solder joints and intermittent failure .
2. Electrical overloads
Repeated high-current switching degrades the internal contacts. When these contacts wear out, they fail to close properly, interrupting power to the fuel pump .
3. Moisture and contaminants
Water, dirt, and debris can corrode the relay's terminals, creating poor electrical connections or short circuits. Regular inspection of the relay's location helps mitigate this risk .
4. Voltage spikes
Faulty alternators, dead batteries, or poor grounding can introduce erratic voltage levels, stressing the relay beyond its design limits .
Recommended Replacement: KEMSO Fuel Pump for Your 1997 Honda Accord
If you've confirmed that the relay is not the problem and you need to replace the fuel pump itself, we recommend the KEMSO Fuel Pump for your 1997 Honda Accord. KEMSO fuel pumps are high-performance, OEM replacement units that meet or exceed original equipment specifications. They are engineered for reliable fuel delivery and long service life. Best of all, every KEMSO fuel pump comes with a lifetime warranty, so you can install it with confidence knowing it's built to last.
To browse the complete selection of KEMSO fuel pumps for your Honda Accord, visit: https://www.kemsoracing.com/
Final Tips for a Successful Repair
1. Always carry a spare relay
If you have an older vehicle known for relay failures, carry a spare relay in the trunk. A relay swap on the side of the road takes 30 seconds and beats waiting for a tow .
2. Keep the original relay
If you replace the relay but keep the old one, you can re-solder it later and keep it as a spare .
3. Check the fuel pump current draw
If a fuel pump relay fails repeatedly, check whether the fuel pump itself is drawing excessive current. A failing pump pulls more amperage than spec, burning out the relay contacts .
4. Use OEM or high-quality aftermarket parts
Avoid no-name parts, as quality can be inconsistent. OEM or reputable aftermarket brands ensure reliable operation .
5. Test the new relay before final assembly
Turn the key to ON and listen for the fuel pump priming sound before reassembling the dashboard .
Summary
The fuel pump relay on your 1997 Honda Accord is located under the driver's side dashboard, to the left of the steering column, behind the power steering control box. If your Accord cranks but won't start, especially in hot weather, test the relay first by listening for the fuel pump prime, swapping with another relay, or checking for power at the fuel pump. Replacing the relay costs $20 to $40 and takes less than 30 minutes. Avoid the costly mistake of replacing the fuel pump when the relay is at fault.
For more information on high-performance fuel pumps and replacement parts for your Honda Accord, visit https://www.kemsoracing.com/