1998 Nissan Altima Fuel Pump Relay Location: The Complete Guide to Finding and Fixing It

The bottom line: The fuel pump relay on a 1998 Nissan Altima is located inside the Intelligent Power Distribution Module (IPDM) — the main fuse box under the hood on the passenger side, near the battery. The IPDM is a black rectangular box mounted near the right front headlight area . If you are troubleshooting a no-start condition or a fuel pump that won't run, the first thing to do is open this box, locate the fuel pump relay, and check both the relay and the associated fuse. The fuel pump relay is often labeled in the IPDM diagram, but on some models it is a non-serviceable internal relay, meaning the entire IPDM may need replacement if the relay fails .

Understanding the 1998 Nissan Altima Fuel System

The 1998 Nissan Altima uses an electronic fuel injection (EFI) system. The fuel pump is located inside the fuel tank, and it is powered by the vehicle's electrical system through a relay and fuse . The relay acts as a switch that allows the Engine Control Module (ECM) to turn the fuel pump on and off. When you turn the ignition key to the "ON" position, the ECM grounds the relay coil, which energizes the relay and sends power to the fuel pump. You should hear a brief whirring sound from the rear of the car as the pump primes for a few seconds .

The fuel pump relay is a critical component. If it fails, the fuel pump will not receive power, and the engine will crank but not start. Knowing exactly where to find it saves you time and money.

Step-by-Step: Locating the Fuel Pump Relay

1. Open the hood and find the IPDM. The Intelligent Power Distribution Module is located on the passenger side of the engine compartment, right behind the headlight assembly, near the battery . It is a black plastic box with a cover that snaps on.

2. Remove the cover. Press the tab on the side of the IPDM cover and lift it upward. On the underside of the cover, you will find a diagram that shows the location of each fuse and relay. Look for a label that says "Fuel Pump Relay," "FP Rel," or simply "Fuel Pump." The diagram is your best map .

3. Identify the relay and fuse. The fuel pump relay is usually a small, square, plastic component with four or five prongs. In the IPDM, the fuel pump relay is often marked as Relay K or Relay number 17, depending on the exact configuration . The fuel pump fuse is also located in the same IPDM. For the 1998 Altima, check fuse number 32, which is a 15-amp fuse . If the fuse is blown, it will appear visibly broken or you can test it with a multimeter.

4. Understand the "non-serviceable" issue. On some Nissan models of this era, the fuel pump relay is soldered inside the IPDM and cannot be removed separately. If the relay is defective, the entire IPDM module may need to be replaced . However, many owners have successfully swapped the relay by desoldering it and installing a new one, or by replacing the whole IPDM with a used unit from a salvage yard.

Common Symptoms of a Bad Fuel Pump Relay

If the fuel pump relay is failing, you may experience one or more of these symptoms:

• Engine cranks but won't start — This is the most common symptom. The engine turns over normally, but there is no fuel pressure .
• No fuel pump priming sound — When you turn the key to the "ON" position, you should hear the fuel pump hum for about 2-3 seconds. If you hear nothing, the relay, fuse, or pump may be dead .
• Intermittent stalling — The engine may start and run fine, then suddenly die while driving, especially on hot days or after long trips. This can happen when the relay gets hot and fails temporarily .
• Engine starts but runs poorly — A weak or failing relay may not deliver full voltage to the pump, causing low fuel pressure, hesitation, sputtering, or poor acceleration .

How to Test the Fuel Pump Relay and Circuit

Before you assume the fuel pump itself is bad, test the relay and its circuit. Here is a practical, step-by-step approach:

Step 1: Listen for the relay click. With the ignition off, open the IPDM cover and place your ear near the relay. Have a helper turn the ignition key to the "ON" position (do not crank the engine). You should hear a distinct click from the relay as it energizes . If you hear the click, the relay is likely working, but you still need to check the fuse and pump voltage.

Step 2: Check the fuse. Remove the 15-amp fuel pump fuse (fuse #32) from the IPDM. Inspect it visually—if the metal strip inside is broken, the fuse is blown. Also test it with a multimeter set to continuity mode. If the fuse is blown, replace it with a new one of the same amperage .

Step 3: Swap the relay. If you are not sure whether the relay is good, find another relay in the same IPDM that is identical in size and pin configuration (for example, the horn relay or the cooling fan relay). Swap the suspect relay with the known good one. If the fuel pump starts working, the original relay was defective .

Step 4: Test for voltage at the fuel pump connector. If the relay and fuse are good, the next step is to check if power is reaching the fuel pump. The fuel pump is located inside the fuel tank. You can access its electrical connector under the rear seat or near the fuel tank. Disconnect the connector and use a multimeter to check for 12 volts when the ignition is turned to "ON." If there is no voltage, the problem is in the wiring between the IPDM and the pump .

Step 5: Perform a fuel pressure test. This is the most definitive test. Connect a fuel pressure gauge to the Schrader valve on the fuel rail. Turn the ignition to "ON" and check the pressure. The 1998 Nissan Altima should have 34-38 PSI of fuel pressure . If the pressure is low or zero, the pump or the relay circuit is failing.

Where Else to Look: The Under-Dash Fuse Box

While the main fuel pump relay is in the IPDM under the hood, some 1998 Altima models also have a secondary relay or a fuse inside the cabin. The interior fuse box is typically located under the dashboard on the driver's side, near the kick panel. Check your owner's manual for the exact diagram. However, for the fuel pump circuit, the relay under the hood is the primary location .

A Note on the 1998-2001 Nissan Altima

The 1998, 1999, 2000, and 2001 Nissan Altima models share the same basic electrical architecture. The fuel pump relay location is consistent across these years — it is always in the IPDM under the hood, on the passenger side . The fuse box diagrams for these years are also very similar. If you are working on a 1999 or 2000 Altima, the same instructions apply .

Frequently Asked Questions

Q: Can I replace the fuel pump relay myself?
Yes, as long as the relay is a removable type. If the relay is soldered into the IPDM, you will need to either desolder it or replace the entire module. Many DIYers find it easier to replace the whole IPDM with a used unit from a salvage yard .

Q: How much does a fuel pump relay cost?
A replacement relay for a 1998 Nissan Altima typically costs between $10 and $30 from an auto parts store. If you need to replace the entire IPDM, a used unit costs $50 to $150, and a new one can be $200 or more.

Q: What if the fuel pump still doesn't work after replacing the relay and fuse?
The problem may be with the fuel pump itself, the wiring harness, or the ECM. Test for voltage at the fuel pump connector as described above. If there is voltage but the pump does not run, the pump is defective and needs replacement . If there is no voltage, trace the wiring back to the IPDM and check for breaks or corrosion.

Q: Can a bad fuel pump relay drain the battery?
No, a failed relay typically either works or doesn't. It will not drain the battery. However, a stuck relay that remains energized can cause the fuel pump to run continuously, which can overheat the pump and drain the battery over time.

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Final Thoughts

Finding the fuel pump relay on a 1998 Nissan Altima is straightforward once you know where to look. The relay is inside the Intelligent Power Distribution Module under the hood, on the passenger side near the battery. Always start your diagnosis by checking the fuse and relay before replacing the fuel pump — this can save you hundreds of dollars and hours of labor. If you do need a new fuel pump, trust KEMSO for a high-quality, long-lasting replacement that comes with a lifetime warranty.

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