2002 GMC Yukon Fuel Pump Fuse: Location, Diagnosis, and Replacement Guide

The bottom line: If your 2002 GMC Yukon cranks but won't start, the fuel pump fuse is one of the first components you should check. The fuel pump fuse for a 2002 GMC Yukon is located in the underhood fuse/relay center, which sits in the rear of the engine compartment near the brake fluid reservoir . On the fuse box diagram, it is labeled as "F/PMP" and protects the fuel pump circuit . A blown fuse means no power reaches the fuel pump, and the engine will not start. But before you replace it, you need to understand why it blew, because simply swapping in a new fuse without fixing the root cause can lead to another failure.

Understanding the Fuel Pump Fuse and Its Role

The fuel pump fuse is a critical safety component in your 2002 GMC Yukon's electrical system. Its primary job is to protect the fuel pump wiring and the pump itself from excessive current. If too much current flows through the circuit—due to a short circuit, a failing fuel pump motor drawing too many amps, or a damaged wire—the fuse blows and breaks the circuit. This prevents electrical fires and further damage to the vehicle's electrical system .

The fuel pump fuse works hand-in-hand with the fuel pump relay. When you turn the ignition key to the "on" position, the engine control module (PCM) energizes the fuel pump relay. The relay then closes its internal contacts, allowing battery voltage to flow through the fuel pump fuse and onward to the fuel pump. The fuel pump runs for about two seconds to pressurize the fuel system, then shuts off unless the engine is cranking or running . If the fuse is blown, the entire circuit is dead, and the pump will not receive power at all.

2002 GMC Yukon Fuel Pump Fuse Location

The underhood fuse/relay center on a 2002 GMC Yukon is located in the rear of the engine compartment, on the driver's side, near the brake fluid reservoir . To access it:

  1. Open the hood and locate the black plastic fuse box mounted near the brake master cylinder on the driver's side firewall.
  2. Press the tabs on the sides of the cover and lift it off.
  3. Look at the diagram printed on the underside of the cover. The fuel pump fuse is labeled as "F/PMP" . According to the factory fuse box diagram, this is a 20-amp fuse .
  4. The fuel pump relay is also in this same box, labeled as "F/PMP" relay, and is located nearby .

If the diagram on your cover is missing or faded, you can also check the owner's manual for the exact fuse location. The fuel pump fuse is typically a standard blade-type fuse, and you can visually inspect it by pulling it out of its socket. A good fuse will have a continuous metal strip visible through the transparent plastic top. A blown fuse will have a broken or melted strip.

How to Test the Fuel Pump Fuse

Testing the fuel pump fuse is straightforward and requires only a few basic tools. You can use a test light or a multimeter.

Using a test light:

  1. Turn the ignition off.
  2. Locate the fuel pump fuse in the underhood fuse center.
  3. Touch the test light probe to one of the small metal terminals on top of the fuse (the exposed metal contacts on the fuse face).
  4. Touch the other end of the test light to a good ground, such as a metal bolt on the engine or chassis.
  5. If the test light illuminates, that side of the fuse has power.
  6. Repeat the test on the other terminal. If both terminals light up, the fuse is good. If only one side lights up, the fuse is blown.

Using a multimeter:

  1. Set your multimeter to measure resistance (ohms).
  2. Remove the fuse from its socket.
  3. Touch one probe to each of the two metal terminals on the fuse.
  4. A good fuse will show near-zero resistance (continuity). A blown fuse will show infinite resistance (no continuity).

Common Symptoms of a Blown Fuel Pump Fuse

A blown fuel pump fuse causes several distinct symptoms that you can easily identify:

1. Engine cranks but won't start. This is the most common symptom. The starter motor turns the engine over normally, but the fuel pump does not run, so no fuel reaches the engine. You will not hear the typical two-second prime hum from the fuel tank when you turn the key to the "on" position .

2. No fuel pump prime sound. When you turn the ignition key to the "on" position (without cranking), the fuel pump should run for about two seconds to pressurize the system. If you do not hear a faint humming sound coming from the rear of the vehicle (near the fuel tank), the fuse may be blown, or the relay may be faulty .

3. Engine stalls while driving. If the fuse blows while you are driving, the engine will suddenly lose power and stall. You will not be able to restart the vehicle until the fuse is replaced and the underlying cause is addressed .

4. Intermittent starting issues. In some cases, a loose or partially blown fuse can cause intermittent power loss to the fuel pump. The engine may start sometimes and fail other times, making it unpredictable to drive.

What Causes the Fuel Pump Fuse to Blow?

A fuel pump fuse does not blow for no reason. If you find a blown fuse, you must investigate the root cause before simply replacing it. Common causes include:

1. A failing fuel pump motor. As the fuel pump motor wears out, its internal bearings and brushes can cause the motor to draw excessive current. This increased amp draw can overload the fuse and cause it to blow. This is the most common cause of a repeatedly blown fuel pump fuse .

2. A short circuit in the fuel pump wiring. The wiring harness that runs from the fuse box to the fuel pump can become damaged over time. Wires can rub against sharp metal edges, chafe through their insulation, and short to ground. This creates a direct path for current to flow, instantly blowing the fuse .

3. A corroded or damaged fuel pump connector. The electrical connector at the top of the fuel pump module (inside the fuel tank) can develop corrosion or loose terminals. This can cause increased resistance and heat, which can lead to a short circuit or excessive current draw .

4. A faulty fuel pump relay. While less common, a relay that sticks in the closed position can keep the fuel pump running continuously, even when the engine is off. This can overload the circuit and blow the fuse .

5. Moisture or water intrusion. If the underhood fuse box gets wet due to a leaking windshield, a clogged cowl drain, or pressure washing, moisture can cause corrosion on the fuse terminals or create a short circuit inside the fuse box.

Step-by-Step Diagnostic Procedure

If your 2002 GMC Yukon has a blown fuel pump fuse, follow this step-by-step diagnostic procedure to find and fix the problem:

Step 1: Replace the fuse and test. Start by installing a new fuse of the correct amperage (20-amp). Turn the ignition to the "on" position. If the fuse blows immediately, you have a direct short circuit in the wiring. If the fuse holds, turn the key to the "start" position and crank the engine. If the fuse blows during cranking, the problem is likely in the fuel pump motor or the wiring under the vehicle.

Step 2: Listen for the fuel pump. With a new fuse installed, listen for the fuel pump prime sound when you turn the key to "on." If you hear the pump run for two seconds, the basic circuit is working. If you do not hear it, the relay or the pump itself may be faulty, even if the fuse is good .

Step 3: Check the fuel pump relay. If the fuse is good but the pump does not run, the next step is to check the fuel pump relay. You can swap the fuel pump relay with another identical relay in the fuse box (such as the horn relay or A/C relay) to see if the pump starts working. If it does, the original relay was bad .

Step 4: Inspect the wiring. If the fuse blows repeatedly, visually inspect the wiring harness that runs from the underhood fuse box down to the frame and back to the fuel tank. Look for chafed wires, melted insulation, or areas where the harness rubs against sharp metal edges. Pay special attention to areas near the exhaust system, where heat can damage the wiring.

Step 5: Test the fuel pump's amp draw. If the wiring looks good, the fuel pump motor itself may be drawing too much current. You can test this with a multimeter that has an amp clamp. At the fuel pump fuse, measure the current draw when the pump is running. A healthy fuel pump typically draws between 4 and 8 amps. If the reading is above 10 amps, the pump is failing and needs to be replaced.

How to Replace the Fuel Pump Fuse

Replacing the fuel pump fuse on a 2002 GMC Yukon is a simple task:

  1. Turn off the ignition and remove the key.
  2. Open the underhood fuse/relay center cover.
  3. Locate the fuel pump fuse, labeled "F/PMP" .
  4. Use a fuse puller (usually stored inside the fuse box cover) or a pair of needle-nose pliers to gently pull the fuse straight out of its socket.
  5. Inspect the fuse. If the metal strip inside is broken or melted, the fuse is blown.
  6. Install a new 20-amp blade-type fuse. Make sure the new fuse is the same amperage rating. Never use a higher-amp fuse, as this can cause wiring damage or a fire.
  7. Push the fuse firmly into the socket until it is fully seated.
  8. Replace the fuse box cover.
  9. Test the system by turning the ignition to the "on" position and listening for the fuel pump prime sound.

Preventing Future Fuel Pump Fuse Failures

To avoid repeated fuel pump fuse failures, address the underlying issues:

  • Replace a failing fuel pump early. If your fuel pump is making noise, causing hard starting, or showing signs of age, replace it before it damages the electrical system. A pump that draws excessive current will eventually blow the fuse and leave you stranded.
  • Keep the underhood fuse box dry. Ensure that the cowl area at the base of the windshield is clear of leaves and debris. Check that the fuse box cover is properly sealed to prevent moisture intrusion.
  • Inspect wiring regularly. During routine maintenance, visually inspect the fuel pump wiring harness for signs of chafing, corrosion, or damage. Catch problems early before they cause a short circuit.
  • Use the correct fuse rating. Always use a 20-amp fuse for the fuel pump circuit on a 2002 GMC Yukon. Using a lower-amp fuse will cause nuisance blowouts, while a higher-amp fuse can lead to wiring damage.

When to Call a Professional

If you have replaced the fuse and it blows again immediately, or if you cannot find the source of the short circuit, it is time to seek professional help. Diagnosing electrical problems in a fuel system can be dangerous, especially if you are working near the fuel tank. A qualified mechanic has the tools and expertise to perform a thorough electrical diagnosis, including checking the fuel pump resistance, testing the wiring harness for shorts, and verifying the relay operation. Safety should always be your top priority when working with fuel systems and electrical components.

Recommended Fuel Pump Replacement: KEMSO Fuel Pump

If your diagnostic process reveals that the fuel pump itself is the root cause of the blown fuse, it is time to replace the pump. For a reliable, high-performance replacement, consider the KEMSO Fuel Pump for your 2002 GMC Yukon. KEMSO fuel pumps are engineered as OEM replacement units, meaning they meet or exceed the original equipment manufacturer's specifications for fit, performance, and durability. Each pump is built with high-quality materials and precision components to ensure a perfect fit and reliable operation.

KEMSO stands behind its products with a lifetime warranty, giving you peace of mind that your investment is protected. Whether you are replacing a factory pump that has failed or upgrading to a more reliable unit, KEMSO fuel pumps deliver the performance and longevity your vehicle needs. To browse the full selection of KEMSO fuel pumps and find the exact model for your 2002 GMC Yukon, visit the official KEMSO website at: https://www.kemsoracing.com/

Final Thoughts

The fuel pump fuse on your 2002 GMC Yukon is a small but vital component that protects the fuel system and the rest of the vehicle's electrical system. Knowing its location in the underhood fuse/relay center, understanding how to test it, and recognizing the symptoms of a blown fuse can save you time and frustration when your truck refuses to start. Always remember that a blown fuse is a symptom, not the root cause. Take the time to diagnose why the fuse blew, whether it is a failing fuel pump, damaged wiring, or a faulty relay. By addressing the underlying issue, you can prevent future breakdowns and keep your Yukon running reliably for years to come.

For more information on fuel pump replacement and to find the right KEMSO fuel pump for your 2002 GMC Yukon, visit https://www.kemsoracing.com/


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