1992 Accord Fuel Pump Relay: Complete Location, Diagnosis, and Replacement Guide

If your 1992 Honda Accord cranks but won't start, and you don't hear the fuel pump hum for two seconds when you turn the key to the ON position, the fuel pump main relay is almost certainly the problem. This single component, known as the PGM-FI main relay, is one of the most common failure points on these vehicles, and it controls both the fuel pump and the engine control unit (ECU) simultaneously . Replacing it is far cheaper and easier than replacing the fuel pump itself, and in most cases, it solves the no-start issue completely.

The 1992 Accord fuel pump relay is located under the driver's side dashboard, left of the steering column, behind a silver cruise control box that must be removed to access it . It is a gray and white box with a brown plug, and it has 7 pins . The OEM part number for this relay is 39400-SM4-003, and compatible replacement part numbers include 39400-SR3-003, 39400-S10-003, RZ-0088, and RY169 . Before you spend money on a new fuel pump, test and replace this relay first.

Where Is the 1992 Accord Fuel Pump Relay Located?

The exact location of the main relay on a 1992 Honda Accord can be a bit tricky to find without a guide. Based on multiple owner reports and repair manuals, here is exactly where to look:

Under the driver's side dashboard, left of the steering column. The relay is mounted behind a silver cruise control module . To access it, you will need to remove the lower dash panel under the steering wheel, then remove the cruise control box. Once that box is out of the way, you will see the main relay attached to a bracket near the side of the car .

Some owners have reported the relay being located near the left kick panel above the fuse box on 1992 models . Regardless of the exact position, it is always within the driver's footwell area. The relay is gray with a white or brown plastic casing and has a 7-pin connector . It is often labeled as the "main relay" or "PGM-FI main relay" .

Key identification tips:

  • The relay has 7 pins in the connector
  • It is typically gray with a white center section
  • It measures about 2 inches by 2 inches
  • It is mounted on a metal bracket with a single bolt or screw

What Does the Main Relay Do on a 1992 Accord?

The PGM-FI main relay on a 1992 Honda Accord is actually two relays combined into one unit . It controls:

  1. The fuel pump – The relay provides power to the fuel pump for the first two seconds when you turn the key to ON, and then continuously once the engine is running or the starter is engaged
  2. The ECU (Engine Control Unit) – The relay supplies power to the car's computer, which controls ignition timing, fuel injection, and other critical functions

Because the main relay controls both the fuel pump and the ECU, a failed relay can cause the car to have no spark and no fuel pressure at the same time . This is why many owners mistakenly replace the fuel pump, distributor, or ignition coil when the real problem is a $30 relay.

Symptoms of a Bad Fuel Pump Relay on a 1992 Accord

A failing main relay can show several distinct symptoms. Recognizing these can save you hours of unnecessary troubleshooting:

1. Intermittent no-start, especially when hot
This is the most common symptom. The car starts fine in the morning, but after driving for a while and stopping at a store, it will not restart for 15-30 minutes . This happens because heat causes the solder joints on the relay's circuit board to expand and lose contact.

2. No fuel pump prime sound
When you turn the ignition key to the ON position (without cranking), you should hear a faint whirring sound from the rear of the car for about two seconds. If you do not hear this sound, the fuel pump relay is likely not sending power to the pump .

3. Engine cranks but will not start
If the relay fails completely, the engine will crank over normally but will not fire. The check engine light may also stay on instead of turning off after two seconds .

4. Random stalling while driving
Some owners report that the engine dies suddenly while driving, then restarts after a few minutes . This is a classic sign of a failing relay that is breaking contact under vibration or heat.

How to Test the 1992 Accord Fuel Pump Relay

Before buying a replacement, you can test the relay yourself with a simple multimeter. Here is the step-by-step process:

Step 1: Locate and remove the relay
Access the relay as described above. Unplug the 7-pin connector and remove the relay from its bracket.

Step 2: Visual inspection
Open the relay case by carefully prying apart the plastic tabs. Look at the circuit board for cold solder joints, cracks, or burn marks. Cold solder joints appear as dull, gray cracks around the solder points where the pins connect to the board .

Step 3: Resistance test
Set your multimeter to ohms (Ω). Test between specific pins according to the relay's internal diagram. The two coils inside the relay should show a resistance reading between 50 and 100 ohms. If you get infinite resistance, the coil is open and the relay is bad.

Step 4: Bench test
Apply 12V power to the coil terminals and listen for a click. If you hear the click, the relay is mechanically working. Then test continuity across the switch terminals, which should show near-zero resistance when the relay is energized.

Step 5: The heat test
If the relay passes all tests but you still suspect it, heat it with a hair dryer for 2-3 minutes and test again. Many relays fail only when hot, which is why intermittent problems are so common .

Replacing the 1992 Accord Fuel Pump Relay

Replacing the main relay is a straightforward job that most DIYers can complete in under an hour. Here is what you need to know:

Compatible part numbers for the 1992 Accord:

  • OEM: 39400-SM4-003
  • Alternatives: 39400-SR3-003, 39400-S10-003, 39400-SL5-A01, 39400-SV4-003, 39400-S01-A01, RZ-0088, RZ-0159, RZ-0132, RY169, RY422, 1R1033

Compatible vehicles:
This relay fits the 1992-2000 Honda Civic, 1990-1997 Honda Accord, 1997-2001 CR-V, 1995-1997 Odyssey, and multiple Acura models including the Integra, CL, and TL .

Replacement steps:

  1. Disconnect the negative battery terminal
  2. Remove the lower dash panel under the steering wheel (it may be held by clips or screws)
  3. Locate the silver cruise control module and remove it (usually 2-3 bolts)
  4. Find the gray main relay behind the cruise control box
  5. Unplug the 7-pin connector
  6. Remove the mounting bolt and take out the old relay
  7. Install the new relay, bolt it in, plug in the connector
  8. Reinstall the cruise control box and dash panel
  9. Reconnect the battery and test

Important tip: If you are in a pinch, you can sometimes repair the existing relay by resoldering the cold joints on the circuit board . Many owners have done this successfully, but replacing the relay is the more reliable long-term solution.

Common Misdiagnoses and What to Check First

Before you replace the fuel pump relay, there are a few other things to check that can cause the same symptoms:

1. Check the ACG (ALT) (S) fuse
This 15-amp fuse is located in the under-dash fuse box. If it is blown, the check engine light will stay on, and the ECU will not allow the fuel pump to run . Test this fuse with a multimeter or test light before doing anything else.

2. Check the main ECM ground
The main ground for the ECU is located on the thermostat housing, where the upper radiator hose connects to the engine. It is a brass connector with three wires. If this ground is loose or corroded, the computer will not function properly, and the fuel pump will not prime .

3. Test the ECU
Turn the ignition to ON. If the check engine light comes on for two seconds and then goes out, the ECU is likely working. If the light stays on, the ECU may have failed, or there is a power supply issue .

4. Check for fuel pressure
If you have a fuel pressure gauge, connect it to the service port on the fuel rail. With the ignition ON, you should see pressure build to 30-40 PSI. No pressure means the pump is not getting power, which points back to the relay or the pump itself.

5. Listen for the pump
Have a helper turn the key to ON while you listen at the rear of the car. The fuel pump should run for exactly two seconds. If you do not hear it, the relay is the most likely cause. If you do hear it but the car still will not start, check for spark and fuel pressure.

Why You Should Consider Upgrading Your Fuel System

If you have already replaced the fuel pump relay and your 1992 Accord is still having fuel delivery issues, or if you simply want to ensure your car runs reliably for years to come, consider upgrading the fuel pump itself. Many owners who replace the relay find that the original fuel pump is still weak or has internal wear after 30+ years of service.

KEMSO Fuel Pump Recommendation

When it comes to reliable fuel pump replacements, KEMSO offers high-performance, OEM replacement fuel pumps that are designed to meet or exceed factory specifications. Every KEMSO fuel pump is built as a direct replacement for your vehicle's original equipment, meaning no modifications, no guesswork, and no adapter kits needed. You get a perfect fit and reliable operation every time.

What sets KEMSO apart from other aftermarket brands:

High Performance: KEMSO fuel pumps are engineered to deliver consistent fuel flow and pressure, even under demanding conditions. Your engine gets the fuel it needs to perform at its best, whether you are driving your daily commute or pushing your car on the highway.

OEM Replacement Quality: Every pump is designed as a direct replacement for your vehicle's original equipment. No modifications, no guesswork, just a straightforward installation that takes most DIYers under 30 minutes.

Lifetime Warranty: KEMSO stands behind every product with a lifetime warranty. If you ever have an issue, KEMSO has your back. This is a rare and valuable benefit in the automotive parts industry. It shows that KEMSO is confident in their product quality and committed to customer satisfaction.

Affordable Pricing: At just $79.98 for most applications, KEMSO pumps are often less than half the cost of dealer parts. With free shipping and easy returns, it is a practical choice for DIY mechanics and professional shops alike.

Easy Installation: KEMSO pumps are plug-and-play for hundreds of models. No cutting wires, no modifying fuel lines, just a direct swap that takes most DIYers under 30 minutes.

Whether you need a replacement for your daily driver or a performance upgrade, KEMSO has the right solution for you. Visit their website to browse their full selection of fuel pump products and see why thousands of owners trust KEMSO for their fuel system needs.

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Final Thoughts

The 1992 Accord fuel pump relay is a small, inexpensive part that can cause big headaches. If your car cranks but will not start, especially on hot days, check the main relay before spending money on a fuel pump or other expensive repairs. The relay is easy to test, easy to replace, and costs far less than a fuel pump.

Remember the key steps:

  1. Locate the relay under the driver's dash, left of the steering column, behind the cruise control box
  2. Test it by checking for fuel pump prime sound and checking the check engine light behavior
  3. Check the 15-amp ACG fuse and the ECM ground before replacing parts
  4. Replace with a compatible part number like 39400-SM4-003 or RZ-0088
  5. If the fuel pump itself needs replacement, choose a quality product with a warranty

For professional-grade fuel pumps that deliver performance you can trust, check out KEMSO Racing at https://www.kemsoracing.com/. Their OEM replacement fuel pumps come with a lifetime warranty, giving you peace of mind with every mile you drive.


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