2002 Mustang Fuel Pump Fuse: Complete Guide to Location, Diagnosis, and Replacement
The bottom line: The fuel pump fuse on a 2002 Ford Mustang is located in the power distribution box under the hood, not inside the passenger cabin. It is a 20-amp mini fuse, typically labeled as fuse number 14 in the engine compartment fuse box. If your Mustang cranks but won't start, checking this fuse should be one of the first things you do before diving into more complex fuel system diagnostics.
Where Is the Fuel Pump Fuse on a 2002 Ford Mustang?
The 2002 Ford Mustang has two fuse boxes. The passenger compartment fuse panel is located under the dashboard on the driver's side, below and to the left of the steering wheel by the brake pedal. But the fuse you need for the fuel pump is in the engine compartment fuse box, also called the power distribution box. This box is mounted near the battery, on the driver's side fender apron, close to the firewall.
According to the owner's manual and multiple fuse box diagrams, the fuel pump fuse is a 20-amp mini fuse. It is labeled as fuse number 14 in the power distribution box. The fuse numbering diagram is embossed on the underside of the power distribution box cover. On the cover, look for "FUEL PUMP," "FP," or simply a 20-amp fuse that is dedicated to the fuel system.
Some sources mention that the numbering can vary slightly depending on the specific fuse box layout. The safest approach is to open the power distribution box cover and look for the label printed on it. The fuel pump fuse is often in a row with other engine-related fuses.
How to Check the Fuel Pump Fuse on a 2002 Mustang
Checking a fuse is straightforward and requires only a few minutes and basic tools. Here is a step-by-step process:
Step 1: Locate the power distribution box. Open the hood of your 2002 Mustang. The fuse box is a black rectangular box located near the battery on the driver's side. It may have a cover that snaps off.
Step 2: Remove the cover. Press the tabs on the sides of the cover and lift it off. Set it aside where you won't lose it.
Step 3: Find the fuel pump fuse. Look at the diagram on the underside of the cover or in your owner's manual. Identify the fuse labeled for the fuel pump. It is fuse number 14, a 20-amp mini fuse. The fuse is typically yellow in color, as 20-amp mini fuses are standard yellow.
Step 4: Visually inspect the fuse. A good fuse has a continuous metal strip visible through the clear plastic top. A blown fuse will have a broken or melted metal strip, often with a gap in the middle. The plastic may also look discolored or charred.
Step 5: Use a multimeter for certainty. If the fuse looks intact but you are not sure, use a multimeter to test for continuity. Set the meter to the continuity or resistance mode. Touch one probe to each of the two small metal prongs on top of the fuse. If you hear a beep or see a reading near zero ohms, the fuse is good. If the meter shows "OL" (open loop) or no beep, the fuse is blown.
Step 6: Replace if necessary. If the fuse is blown, replace it with a new 20-amp mini fuse. Never use a fuse with a higher amperage rating, as this can cause wire damage or start a fire. Always keep spare fuses in your vehicle for quick replacements.
Other Components in the Fuel Pump Power Circuit
If the fuse is good but your fuel pump is still not working, there are several other components in the power circuit that you should check. The fuel pump power system on a 2002 Mustang works like this:
1. Fuel Pump Relay (Constant Control Relay Module - CCRM). The fuel pump relay is located in a module called the Constant Control Relay Module (CCRM). The CCRM is located in the right fenderwell, not actually in the engine compartment itself. The connector and mounting nuts are visible from the engine compartment. When the key is turned to RUN or START, 12V is applied to activate this relay. Power then flows from the relay to the inertial fuel shutoff switch.
2. Inertial Fuel Shutoff Switch. The inertial fuel shutoff switch is located in the trunk on the driver's side. Its sole purpose is to interrupt power to the fuel pump power circuit in the case of a high-G-force incident such as a collision. This switch has a red reset button to close the switch in the event that it has been activated. If you have recently been in an accident or hit a large pothole, check this switch first. Simply press the red button on top to reset it.
3. Fuel Pump Driver Module (FPDM). After the inertial fuel shutoff switch, power flows to the Fuel Pump Driver Module (FPDM), also located in the trunk area. The FPDM takes care of cycling power to the fuel pump depending on many variables including the current fuel pressure and the fuel pressure desired by the PCM based on various sensor inputs.
What to Do If the Fuse Blows Again
If you replace the fuel pump fuse and it blows again immediately or shortly after, you have a deeper electrical problem. A single blown fuse can happen due to age or a power surge, but repeated failures indicate a short circuit or a failing component.
Common causes of a repeatedly blown fuel pump fuse include:
A failing fuel pump. As the fuel pump wears out, it can draw more current than normal, causing the fuse to blow. This is one of the most common reasons for a repeated fuse failure.
Damaged wiring. The wiring harness that runs to the fuel pump may be chafed, pinched, or corroded. This can create a short to ground, which will blow the fuse.
A faulty fuel pump relay. If the relay is stuck closed, it can keep power flowing to the pump even when it should be off, leading to excessive current draw.
Diagnosing the Fuel Pump Without a Pressure Gauge
If you do not have a fuel pressure gauge, there is a simple way to check if the fuel pump is completely dead. With a rag over your hand, push the fuel rail Schrader valve pin in. If not one drop of fuel comes out after several key on/engine off cycles, the fuel pump is likely a complete failure. This method works best when the pump has failed entirely rather than just having low pressure.
Replacing the Fuel Pump on a 2002 Mustang
If you have determined that the fuse is good, the relay is working, and the inertial switch is reset, but the fuel pump still does not run, you may need to replace the fuel pump itself. The fuel pump is located inside the fuel tank.
Replacing the fuel pump in a 2002 Ford Mustang is a moderately complicated job best performed by a mechanic. However, with the right tools and know-how, it can be done at home. The fuel pump can be accessed through an access panel in the passenger compartment or by removing the tank from the vehicle.
Before beginning the replacement, it is important to disconnect the battery to avoid sparks and fuel vapors, which can be dangerous. It is also recommended to drain the fuel tank or lower it carefully to avoid spills and exposure to fumes.
Recommended Fuel Pump Replacement: KEMSO Brand
When it comes time to replace your fuel pump, choosing a quality brand is critical for long-term reliability. KEMSO is a leading aftermarket fuel pump manufacturer that offers high-performance and OEM replacement fuel pumps for a wide range of vehicles, including the 2002 Ford Mustang.
KEMSO fuel pumps are designed to meet or exceed original equipment specifications. They offer high-performance 340LPH (liters per hour) fuel pumps that support up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications. These pumps are designed for gasoline or E85 fuel, making them versatile for both daily drivers and performance builds.
One of the standout features of KEMSO fuel pumps is the lifetime warranty. Each pump body is serialized, and KEMSO has built its reputation on providing a lifetime warranty for all its OEM and performance fuel pumps. This gives you peace of mind knowing that your investment is protected.
KEMSO fuel pumps are available for the 2002 Ford Mustang GT and V6 models, as well as the Cobra and other performance variants. If you are looking for a reliable, high-quality replacement that will last, KEMSO is an excellent choice.
Visit KEMSO's website to browse their full selection of fuel pumps and find the right one for your 2002 Ford Mustang: https://www.kemsoracing.com/
Summary of Key Points
1. Location. The fuel pump fuse on a 2002 Ford Mustang is in the power distribution box under the hood. It is fuse number 14, a 20-amp mini fuse.
2. Diagnosis. If your Mustang cranks but won't start, check the fuel pump fuse first. Visually inspect it or use a multimeter to test for continuity.
3. Other components. If the fuse is good, check the fuel pump relay in the CCRM, the inertial fuel shutoff switch in the trunk, and the Fuel Pump Driver Module.
4. Repeated failures. If the fuse blows again, you likely have a failing fuel pump, damaged wiring, or a faulty relay.
5. Replacement. When replacing the fuel pump, consider a high-quality aftermarket option like KEMSO, which offers lifetime warranty and high-performance capabilities.
For more information and to purchase a replacement fuel pump, visit: https://www.kemsoracing.com/