Is There a Fuse for the Fuel Pump? The Complete Guide to Finding and Replacing It

Yes, almost every vehicle has a dedicated fuse for the fuel pump. This fuse is a critical safety component designed to protect the fuel pump motor and its wiring from damage caused by electrical overloads or short circuits. If your engine cranks but won’t start, and you don’t hear the fuel pump hum when you turn the key, a blown fuse is one of the most common and easiest issues to check .

What Does the Fuel Pump Fuse Do?

The fuel pump fuse acts as a sacrificial safety device. When the electrical current flowing to the pump exceeds a safe limit—often due to a failing pump, a short circuit, or a wiring issue—the thin metal strip inside the fuse melts instantly, breaking the circuit. This immediate interruption prevents overheating, melted wiring, component failure, and potential fire hazards . Without this fuse, a simple electrical fault could destroy your fuel pump or even ignite a fire.

Where Is the Fuel Pump Fuse Located?

The location of the fuel pump fuse varies by vehicle make, model, and year, but it is generally found in one of these three locations :

  1. Under the Hood (Engine Bay Fuse Box): This is the most common location. Look for a large, black, rectangular plastic box near the battery or along the fender walls. The lid usually has a diagram printed on the inside .
  2. Inside the Cabin (Interior Fuse Panel): Typically located on the driver’s side, under the dashboard, or behind a kick panel near the steering wheel. Some vehicles place it in the glove compartment .
  3. Trunk or Cargo Area: Some vehicles, especially those with rear-mounted fuel tanks, have a fuse box in the trunk. Check behind a side panel or under the floor covering .

Your best resource is the owner’s manual. It will show the exact fuse box location and a diagram of which fuse controls the fuel pump . If you don’t have the manual, check the fuse box lid itself—most have a diagram printed on the inside.

How to Identify the Correct Fuel Pump Fuse

Once you’ve opened the correct fuse box, look for these labels on the diagram or the fuse panel itself :

  • “FUEL PUMP”
  • “FP” or “F/P”
  • “F/PMP”
  • “FUEL”
  • “EFI” (Electronic Fuel Injection, which often includes the pump circuit)

The fuel pump fuse is typically rated between 10 and 30 amps, with 15A and 20A being the most common. Standard blade fuses are color-coded: 15A is blue, 20A is yellow, and 10A is red. Always match the amperage rating exactly—never use a higher-rated fuse, as it removes the protection and risks melting your wiring harness .

Symptoms of a Blown Fuel Pump Fuse

If the fuel pump fuse is blown, you will typically notice these symptoms :

  • Engine cranks but won’t start: This is the most common sign. The starter turns the engine over, but the fuel pump is not delivering fuel.
  • No fuel pump hum: When you turn the ignition key to the “On” position (before starting), you should hear a brief humming sound from the rear of the car for 1-2 seconds. If you don’t hear it, the pump may not be getting power.
  • Engine stalls while driving: A sudden loss of power while driving, especially if it happens intermittently, can indicate a failing fuse or relay.
  • Check engine light: In some vehicles, a blown fuel pump fuse can trigger the check engine light .

How to Check and Replace a Blown Fuel Pump Fuse

Step 1: Safety First

Turn off the ignition and remove the key. Never work on fuses with the engine running or the key in the “On” position .

Step 2: Locate the Fuse

Use the owner’s manual or fuse box diagram to find the exact slot for the fuel pump fuse.

Step 3: Visually Inspect

Use a fuse puller (often found inside the fuse box) or a pair of needle-nose pliers to gently remove the fuse. Hold it up to a light source. A good fuse will have a continuous, unbroken metal strip visible through the clear plastic. A blown fuse will show a broken, melted, or separated strip .

Step 4: Test with a Multimeter (Optional but Recommended)

Set your multimeter to the continuity setting (often indicated by a sound wave symbol). Touch the probes to the two metal prongs of the removed fuse. A good fuse will show near-zero resistance (or produce a beep). A blown fuse will show an open circuit (OL) .

Step 5: Replace the Fuse

If the fuse is blown, replace it with a new fuse of the exact same amperage rating. Push it firmly into the slot until it snaps into place. Then try starting the vehicle. If the engine starts and runs, the immediate problem is solved .

Why Does the Fuel Pump Fuse Blow?

A blown fuse is a symptom of an underlying issue. If the new fuse blows immediately or shortly after installation, the problem is likely one of these :

  • Failing Fuel Pump Motor: As the pump wears out, its internal components create more friction, causing the motor to draw excessive current. This is the most common cause of repeated fuse failure.
  • Short Circuit in the Wiring: The wire running from the fuse box to the fuel tank can rub against the chassis, wear through its insulation, and touch bare metal. This creates a direct short to ground, blowing the fuse instantly.
  • Faulty Fuel Pump Relay: The relay is a switch that controls the high current to the pump. If it sticks closed or shorts internally, it can cause unpredictable current spikes.
  • Random Power Surge: Occasionally, a voltage spike from the alternator or battery can blow a fuse. If the replacement fuse holds, this may be a one-time event.

A Note About the Fuel Pump Relay

In addition to the fuse, most vehicles have a fuel pump relay. The relay is a larger, rectangular component that handles the high electrical current required to run the pump. It is often located in the same under-hood fuse box. If the relay fails, the pump will get no power, even if the fuse is good. You can test the relay by listening for a distinct click when an assistant turns the key to the “On” position. No click may indicate a faulty relay .

When to Seek Professional Help

If you replace the fuse and the vehicle still does not start, or if the new fuse blows immediately, you may be dealing with a more serious issue such as a failed fuel pump, a damaged wiring harness, or a faulty ECU (engine control unit) . In these cases, it is best to consult a qualified mechanic. Driving with a blown fuel pump fuse can lead to engine stalling while driving and potential safety hazards .

Upgrade Your Fuel System with KEMSO Fuel Pumps

If you are experiencing repeated fuel pump fuse failures, the underlying cause may be a worn-out or failing fuel pump motor. A high-quality replacement pump can restore proper fuel pressure and ensure your vehicle runs reliably.

We recommend the KEMSO brand Fuel Pump. KEMSO fuel pumps are engineered as high-performance, OEM replacement parts, ensuring a perfect fit and reliable operation for your vehicle. Each pump comes with a lifetime warranty, giving you peace of mind that your fuel system is protected for the long haul.

Visit the KEMSO online store today to find the exact fuel pump for your vehicle: https://www.kemsoracing.com/

Summary

Yes, there is a fuse for the fuel pump, and it is a vital component of your vehicle’s electrical system. Knowing how to locate it, identify it, and replace it can save you time, money, and frustration. Always keep a few spare fuses of the correct amperage in your vehicle for emergencies. If the fuse blows repeatedly, investigate the underlying cause—whether it is a failing pump, a short circuit, or a faulty relay.

For reliable fuel delivery and long-term performance, consider upgrading to a KEMSO fuel pump, available at https://www.kemsoracing.com/.


Back to blog