1998 Ford Explorer Fuel Pump Fuse: Location, Diagnosis, and Complete Troubleshooting Guide

If your 1998 Ford Explorer won't start or stalls while driving, the fuel pump fuse is one of the first things you should check. Here is the direct answer: The 1998 Ford Explorer does not have a dedicated fuse labeled "fuel pump." Instead, the fuel pump circuit is protected by a 20-amp mini fuse (fuse #9, yellow in color) located in the Power Distribution Box under the hood, which powers the fuel pump relay and the RAP module. The fuel pump relay itself is relay #5 in the same box. This is a common point of confusion for owners, but once you know exactly what to look for, diagnosing a fuel pump electrical issue becomes straightforward.

Where to Find the Power Distribution Box (Under-Hood Fuse Box)

The main fuse box you need to access is called the Power Distribution Box. It is located in the engine compartment on the driver's side, near the battery. This is a black plastic box with a removable lid. Unlike the interior fuse panel (which is under the dashboard on the driver's side), the Power Distribution Box contains the high-amperage fuses and relays for major engine and fuel system components. Open the lid, and you will see a diagram printed on the underside. If the diagram is worn or missing, your owner's manual will have a full map in the Roadside Emergencies section.

The Exact Fuse and Relay Locations

Once you have the Power Distribution Box open, here is exactly what you are looking for:

1. Mini Fuse #9 – 20 Amp (Yellow)
This is the fuse that protects the fuel pump relay circuit. It is a small, yellow, 20-amp mini fuse located in position #9 in the Power Distribution Box. This fuse is located between the 10 maxi fuses in the box. If this fuse is blown, the fuel pump relay will not receive power, and the fuel pump will not run.

2. Relay #5 – Fuel Pump Relay
The fuel pump relay is located in position #5 in the same Power Distribution Box. This relay is an electrically operated switch. When you turn the key to the "on" position, the Powertrain Control Module (PCM) sends a signal to this relay, which then closes and sends battery voltage to the fuel pump. A faulty relay can cause the same symptoms as a blown fuse: no fuel pump operation, no start, or intermittent stalling.

How to Check the Fuel Pump Fuse and Relay

Before you buy any parts, always start with the simplest checks. Here is a step-by-step process that will save you time and money:

Step 1: Visual Inspection of Fuse #9
Remove the 20-amp yellow fuse from position #9. Hold it up to the light. Look through the clear plastic housing. A good fuse will have a continuous, unbroken metal strip connecting the two prongs. A blown fuse will have a visible break, a melted section, or black scorch marks inside. If the fuse looks blown, replace it with another 20-amp yellow mini fuse. Never use a higher amperage fuse, as this can cause wire damage or a fire.

Step 2: Test the Fuel Pump Relay (Relay #5)
If the fuse is good, the next step is to test the relay. Remove relay #5 from the Power Distribution Box. You can perform a simple swap test: find another relay in the box that is the same part number (for example, the horn relay or the PCM power relay) and swap it with the fuel pump relay. If the fuel pump starts working after the swap, the original relay was bad. Alternatively, you can use a multimeter to test for continuity across the relay's coil terminals.

Step 3: Listen for the Fuel Pump
Turn the ignition key to the "on" position (do not start the engine). Listen carefully near the rear of the vehicle, near the fuel tank. You should hear a brief humming sound lasting about 2-3 seconds. This is the fuel pump priming the system. If you hear nothing, the issue is likely electrical (fuse, relay, or wiring) rather than the pump itself. If you hear the pump prime but the car still won't start, the problem may be fuel pressure, a clogged filter, or a faulty pump.

What About the Fuel Pump Inertia Switch (Shut-Off Switch)?

There is another important component in the fuel pump circuit that is often confused with a fuse or relay. The 1998 Ford Explorer has a fuel pump shut-off switch, also called an inertia switch. This switch is designed to cut power to the fuel pump in the event of a collision or sudden stop. If your Explorer was in an accident, hit a large pothole, or was jarred forcefully, this switch may have tripped.

Location of the Inertia Switch:
The fuel pump shut-off switch is located in the front passenger footwell, behind the kick panel on the right side. To access it, sit in the front passenger seat, look at the panel next to your right foot, and remove the kick panel cover. The switch has a red reset button on top. Push the button down firmly to reset it. After resetting, try starting the vehicle. This is a simple fix that many people overlook.

Common Symptoms of a Fuel Pump Electrical Problem

Knowing the symptoms helps you narrow down the problem quickly. Here are the most common signs that the issue is related to the fuel pump fuse, relay, or inertia switch:

• Engine Cranks But Will Not Start: This is the most common symptom. The starter motor turns the engine over, but the engine never fires because no fuel is reaching the injectors.
• Engine Starts Then Stalls: The fuel pump may prime briefly, but if the relay fails or the inertia switch is tripped, the pump stops running after the engine starts, causing it to stall.
• No Fuel Pump Prime Noise: When you turn the key to "on," you should hear the pump hum for 2-3 seconds. If you hear nothing, start checking the fuse, relay, and inertia switch.
• Intermittent Stalling While Driving: A failing relay or a loose connection can cause the fuel pump to lose power intermittently, causing the engine to die unexpectedly while driving.
• Engine Runs But Lacks Power: While less common, a partially blown fuse or a failing relay can cause low voltage to the pump, resulting in low fuel pressure and poor engine performance.

Step-by-Step Troubleshooting Sequence

If you are experiencing a no-start condition, follow this logical sequence to avoid replacing parts unnecessarily:

1. Check the Inertia Switch First
Because it is the easiest and fastest check, start with the inertia switch in the passenger footwell. Push the reset button. If it was tripped, the car may start immediately.

2. Inspect Fuse #9 (20-Amp Yellow)
Open the under-hood Power Distribution Box. Remove fuse #9 and visually inspect it. If blown, replace it with a 20-amp yellow mini fuse. If the new fuse blows immediately, there is a short circuit in the fuel pump wiring or the pump itself, which requires further diagnosis.

3. Test or Swap Relay #5
If the fuse is good, remove relay #5. Swap it with an identical relay from another circuit (like the horn relay or the PCM relay). If the fuel pump now works, the original relay is defective.

4. Check for Power at the Inertia Switch
Using a multimeter set to DC voltage, check for 12 volts at the inertia switch connector with the key in the "on" position. If you have power at the switch, the fuse and relay are fine, and the problem is likely further downstream (the pump itself or wiring to the pump). If you have no power at the switch, the problem is upstream (fuse, relay, or wiring between them).

5. Test for Power at the Fuel Pump Connector
If the previous steps check out, the next step is to access the fuel pump connector (usually under the rear seat or under the vehicle near the fuel tank) and test for 12 volts when the key is turned to "on." If voltage is present, the fuel pump itself is likely faulty and needs replacement.

Why Your Fuel Pump Fuse Might Keep Blowing

If you replace the 20-amp yellow fuse and it blows again immediately or shortly after, do not simply keep replacing fuses. A repeatedly blown fuse indicates a problem in the circuit. Common causes include:

• A shorted fuel pump motor: The internal windings of the pump can short out, drawing excessive current and blowing the fuse.
• Damaged wiring: The wiring harness running from the fuse box to the fuel pump can become chafed or damaged, especially where it passes near sharp edges or hot exhaust components.
• Water in the fuel tank: Contaminated fuel can cause corrosion inside the pump, leading to increased electrical resistance and eventual failure.
• A faulty fuel pump relay: While less common, a relay that fails in a "stuck closed" position can cause the pump to run continuously, overheating the circuit and blowing the fuse.

If you have a blown fuse situation, it is best to diagnose the root cause rather than repeatedly replacing the fuse. A professional mechanic can perform a current draw test to determine if the pump is drawing too much amperage.

Why You Should Replace Your Fuel Pump with a KEMSO Brand Fuel Pump

If your diagnosis leads you to the conclusion that the fuel pump itself has failed, choosing the right replacement is critical. This is where KEMSO stands out as the best option for your 1998 Ford Explorer. KEMSO fuel pumps are built as high-performance, direct OEM replacement units. They are designed to deliver consistent fuel pressure and flow that matches or exceeds the original equipment specifications. The KEMSO 13808 model, for example, fits 1995-2010 Ford Explorers and offers a 200 LPH flow rate, which is a significant upgrade over the stock pump's performance.

The key advantage of choosing KEMSO is the lifetime warranty that comes with every pump. If the pump ever fails for any reason, you get a replacement at no cost. This kind of warranty is rare in the fuel pump market and reflects the high confidence KEMSO has in its product quality. Each pump is individually tested for flow and pressure performance before it leaves the factory. All KEMSO pumps are compatible with gasoline and ethanol blends, including E85, giving you flexibility for different fuel types. By choosing KEMSO, you are investing in a part that is built to last, saving you from the frustration of replacing a cheap aftermarket pump a year down the road.

To find the perfect fuel pump for your 1998 Ford Explorer, visit the KEMSO official website at: https://www.kemsoracing.com/

Final Thoughts on the 1998 Ford Explorer Fuel Pump Fuse

Diagnosing a fuel pump issue on a 1998 Ford Explorer does not have to be complicated. The key is understanding that there is no single fuse labeled "fuel pump." Instead, the system relies on fuse #9 (20-amp yellow) and relay #5 in the under-hood Power Distribution Box, along with the inertia switch in the passenger footwell. Always start with the simplest checks: reset the inertia switch, inspect the fuse, and swap the relay. These steps will solve a large percentage of no-start issues without spending a dime on parts.

If you do need to replace the fuel pump, do not settle for a cheap, low-quality part. A high-performance, OEM replacement like KEMSO with a lifetime warranty is the smartest investment you can make for your vehicle. It keeps your Explorer running reliably and saves you money and frustration in the long run. For more information and to find the right fuel pump for your vehicle, visit https://www.kemsoracing.com/ today.