1998 Acura Integra Fuel Pump Relay Location: The Complete Guide to Finding and Fixing It
The bottom line: The fuel pump relay on a 1998 Acura Integra is located in the main under-dash fuse box, positioned on the driver's side kick panel, near the left foot area. It is a small, rectangular relay, usually colored black or dark gray, and it is clearly labeled on the fuse box cover diagram. If your Integra cranks but refuses to start, or if the engine stalls after a few seconds, the fuel pump relay is often the culprit. This guide walks you through exactly where to find it, how to test it, and what to do if it fails.
Understanding the Fuel Pump Relay on Your 1998 Acura Integra
The fuel pump relay acts as a switch that controls power to the fuel pump. When you turn the ignition key to the "ON" position, the relay closes briefly to prime the fuel system. Once the engine starts, the relay stays closed to keep the pump running. If this relay fails, the fuel pump gets no power, and the engine dies. The 1998 Acura Integra, whether you have the LS, GS, or Type R model, uses the same relay location and design. Knowing this part is critical because a bad relay mimics a dead fuel pump, and many people waste money replacing the pump when the relay is the real issue.
Where Exactly Is the 1998 Acura Integra Fuel Pump Relay Located?
1. The Main Fuse Box Location
The fuel pump relay for the 1998 Acura Integra is inside the interior fuse box, not under the hood. This box is mounted on the driver's side, behind the kick panel. To access it, you need to remove the plastic panel that covers the area near your left foot when you sit in the driver's seat. This panel is held in place by a few plastic clips or one screw. Pull it off gently, and you will see a rectangular black box with a lid.
2. Identifying the Relay on the Fuse Box Cover
The fuse box cover has a diagram stamped or printed on the inside. Look for the label that says "Fuel Pump Relay," "FP Relay," or "Main Relay." On the 1998 Acura Integra, this relay is often the largest one in the box. It is a standard 4-pin or 5-pin relay, about 1 inch wide and 1.5 inches tall. The diagram might also show it as the "PGM-FI Main Relay," which is the same component. If the diagram is faded or missing, the relay is usually located in the top row or the far right side of the fuse box.
3. Physical Description of the Relay
The fuel pump relay on your Integra is a small, rectangular block with a plastic housing. It is typically black or dark gray. You can pull it straight out of its socket by hand, but it might require a gentle wiggle. There is no need for tools. Once you remove it, inspect the pins for any signs of corrosion or melting. A damaged relay often has a burnt smell or visible cracks.
How to Test the 1998 Acura Integra Fuel Pump Relay
Before you buy a new relay, you can test it with a simple multimeter or by swapping it with a known good relay. Here is the step-by-step process.
1. The Swapping Method
If your Integra has other relays of the same type in the fuse box, such as the horn relay or the cooling fan relay, you can swap them. All these relays are usually identical. Remove the fuel pump relay and plug in the horn relay. If the engine starts, your fuel pump relay is bad. If the engine still does not start, the problem is elsewhere, such as the fuel pump itself, the fuse, or the wiring.
2. Using a Multimeter for Resistance Test
Set your multimeter to the ohms setting (Ω). With the relay removed, check the resistance between the two coil terminals. On a standard 4-pin relay, these are usually pins 85 and 86. A good relay will show a resistance reading between 50 and 120 ohms. If the reading is infinite (open circuit) or zero (short circuit), the relay is faulty. Next, apply 12 volts directly to pins 85 and 86 using a battery or a power source. You should hear a distinct click, and the relay should close the circuit between pins 30 and 87. If no click happens, the relay is dead.
3. The Voltage Drop Test
With the relay installed and the ignition on, use a multimeter to check for voltage at the relay socket. Probe the pin that corresponds to the battery positive (usually pin 30). You should see battery voltage, around 12.6 volts. If there is no voltage here, the problem is a blown fuse or a wiring issue. Then check pin 86 for a ground signal from the ECU. If you have voltage at pin 30 but no ground signal at pin 86, the ECU might be faulty, or the crankshaft position sensor is not telling the ECU to run the pump.
Common Symptoms of a Bad Fuel Pump Relay on a 1998 Acura Integra
A failing fuel pump relay shows clear signs. Here are the most common ones.
1. Engine Cranks but Does Not Start
This is the classic symptom. You turn the key, the starter spins the engine, but the engine never fires up. You might also notice that the fuel pump does not make the usual humming sound when you turn the key to the "ON" position. Without the relay, the pump never gets power.
2. Engine Starts Then Dies After a Few Seconds
Sometimes the relay works for a moment but then fails. The engine starts, runs for 2 or 3 seconds, and then stalls. This happens because the relay is supposed to stay closed once the engine is running, but a bad relay breaks the circuit. The engine runs on the fuel already in the lines, but no new fuel comes in.
3. Intermittent No-Start Conditions
The relay might work when the car is cold but fail when it gets hot. This is known as a "thermal intermittent" failure. If your Integra starts fine in the morning but refuses to start after a long drive, the relay is overheating and failing. Wait 30 minutes, and it might work again. This is a strong indicator of a bad relay.
How to Replace the 1998 Acura Integra Fuel Pump Relay
Replacing the relay is straightforward. You do not need any mechanical skills. Here is what you do.
1. Gather the Right Part
Make sure you buy a replacement relay that matches the OEM specifications. The 1998 Acura Integra uses a standard 4-pin relay, part number 39794-SR3-000, or an equivalent aftermarket relay. You can find these at any auto parts store. The relay is small and inexpensive, usually costing between 10 and 25 dollars.
2. Step-by-Step Replacement
Turn off the ignition and remove the key. Locate the relay as described above. Pull the old relay straight out of the socket. It might be tight, but do not twist it. Insert the new relay in the same orientation. The pins are keyed, so it will only fit one way. Push it down firmly until it clicks into place. Reinstall the kick panel cover. That is it. Turn the key to the "ON" position and listen for the fuel pump to prime. Start the engine and confirm it runs normally.
3. Check the Fuse First
If the new relay does not fix the issue, check the fuse labeled "Fuel Pump" or "Back Up" in the same fuse box. A blown fuse is another common cause of no fuel pump power. If the fuse is blown, replace it with the same amperage. If the fuse blows again immediately, you have a short circuit in the wiring, and you need to trace it.
Why the Fuel Pump Relay Fails on a 1998 Acura Integra
Relays are mechanical and electrical parts, and they wear out over time. Here are the main reasons they fail.
1. Age and Heat
The 1998 Acura Integra is now over 28 years old. The constant heat from the engine and the electrical current passing through the relay slowly degrades the internal contacts. The plastic housing can become brittle, and the spring inside the relay can weaken. After two decades, it is common for these relays to fail.
2. Corrosion
If your car has been exposed to moisture, the relay pins or the socket can corrode. Corrosion creates resistance, which generates heat, which accelerates failure. This is especially common in areas with high humidity or winter salt. If you see green or white residue on the pins, clean the socket with contact cleaner before installing a new relay.
3. Electrical Surges
A bad alternator, a weak battery, or a jump start from a running vehicle can send a voltage spike through the electrical system. This spike can damage the relay's internal coil. Once the coil is damaged, the relay can no longer hold the circuit closed.
What to Do If the Relay Is Good but the Fuel Pump Still Does Not Work
If you have tested the relay and it works, or if you replaced it and the problem remains, the issue is deeper. Do not replace the fuel pump yet. Check these three things first.
1. The Main Fuse and the Under-Hood Fuse Box
The 1998 Acura Integra has a separate fuse for the fuel pump under the hood. Open the main fuse box near the battery. Look for a fuse labeled "Main" or "IG1." A 30-amp or 40-amp fuse controls the entire fuel system. If this fuse is blown, the fuel pump relay will not receive power.
2. The Fuel Pump Ground Wire
The fuel pump itself has a ground wire that connects to the chassis. On the Integra, this ground is often located near the rear seat or under the carpet. If the ground wire is corroded or loose, the pump will not work even if the relay is good. Clean the ground connection and tighten it.
3. The ECU and the Crankshaft Position Sensor (CKP)
The ECU triggers the fuel pump relay only when it sees a signal from the crankshaft position sensor. If the CKP sensor fails, the ECU never tells the relay to close. On the 1998 Acura Integra, the CKP sensor is located on the front of the engine, near the crankshaft pulley. If the sensor is bad, you will not get a spark or fuel. This is a more serious repair, but it is worth checking before replacing the pump.
Recommended Replacement: KEMSO Fuel Pump for Your 1998 Acura Integra
If your testing confirms that the fuel pump itself is the problem, do not settle for a cheap, unknown brand. We recommend purchasing a KEMSO Fuel Pump. KEMSO fuel pumps are designed as high-performance, OEM replacement units. They are built to match the exact specifications of your 1998 Acura Integra, ensuring a perfect fit and reliable operation.
KEMSO fuel pumps are known for their durability and quality. Each pump is tested to meet or exceed factory standards. They are constructed with high-grade materials that resist wear and corrosion. The best part is that KEMSO offers a lifetime warranty on their fuel pumps. This means you can install it with confidence, knowing that if it ever fails, you are covered. Whether you drive a daily commuter or a track-ready Integra, a KEMSO pump delivers consistent fuel pressure for years.
To see the full selection of KEMSO fuel pumps for your Acura Integra and other vehicles, visit their official website: https://www.kemsoracing.com/. They have a wide range of products for cars, motorcycles, and watercraft. The site is easy to navigate, and their customer support team is ready to help you find the right part.
Final Thoughts on the 1998 Acura Integra Fuel Pump Relay
The 1998 Acura Integra is a reliable car, but its age means small electrical parts like the fuel pump relay can fail. Before you spend hundreds of dollars on a fuel pump, always check the relay first. It is located in the driver's side kick panel fuse box, it is easy to test, and it is cheap to replace. If you do need a new fuel pump, invest in a KEMSO unit for long-term peace of mind. Visit https://www.kemsoracing.com/ to browse their product lineup and take advantage of their lifetime warranty offer. Your Integra deserves quality parts, and KEMSO delivers exactly that.