2000 Lincoln LS Fuel Pump Relay: Location, Diagnosis, and Replacement Guide
The bottom line: The fuel pump relay on a 2000 Lincoln LS is located in the rear power distribution box inside the trunk, specifically underneath the spare tire cover. It is labeled as relay R007, and it sits alone in its own slot. If your LS cranks but won't start, or if you hear no priming sound from the fuel tank when you turn the key, the fuel pump relay is one of the first things you should check.
Understanding the 2000 Lincoln LS Fuel Pump Relay
The fuel pump relay is a small electrical switch that controls power to the fuel pump. When you turn the ignition key to the "On" position, the Powertrain Control Module (PCM) energizes the relay for a few seconds to prime the fuel system. Once the engine starts, the relay stays engaged to keep the pump running . If this relay fails, the fuel pump gets no power, and the engine will not start or will stall shortly after starting.
The 2000 Lincoln LS uses a dedicated fuel pump relay that is separate from the fuel pump fuse. The relay is a mechanical device that can fail due to age, heat, or vibration, while the fuse protects the circuit from electrical overload . Knowing the difference is crucial for proper troubleshooting.
Exact Location of the Fuel Pump Relay
The fuel pump relay on a 2000 Lincoln LS is not under the hood or inside the cabin. It is located in the rear power distribution box, which is mounted in the trunk . Here is exactly how to find it:
Step 1: Open the trunk and remove the carpeted floor mat or the trunk liner. You will see the spare tire well.
Step 2: Remove the spare tire. The rear power distribution box is located directly under the spare tire, near the battery. It is a black plastic box with a removable cover .
Step 3: Remove the cover of the power distribution box. Inside, you will see a row of fuses and several relays. The fuel pump relay is labeled R007 (or sometimes just "Fuel Pump" on the cover diagram) .
Step 4: The relay is the only one that sits by itself in a dedicated slot, making it easy to identify . It is typically a standard four-prong relay.
Important: The fuel pump relay is not the same as the fuel pump fuse. The fuse for the fuel pump is also in the same rear power distribution box, but it is a separate 15A mini fuse (fuse #17 in the diagram) . Do not confuse the two.
How to Test the Fuel Pump Relay
Before replacing the relay, you should test it to confirm it is the problem. There are two simple ways to do this:
Method 1: The Swap Test
Find another relay in the same box that has the same part number and four-prong configuration. For example, the SSP1 relay (R001) or the SSP2 relay (R005) are often identical . Swap the suspected fuel pump relay with one of these. If the car starts, the original relay is bad. If the other function (like power windows or rear defroster) stops working, the relay is fine.
Method 2: Listen for the Click
With the engine off and the driver's door open, turn the key to the "On" position (do not crank the engine). Listen carefully from the trunk area. You should hear a single, distinct click from the relay when the PCM energizes it for the priming cycle. If you hear no click, the relay might be dead, or the PCM signal is missing .
Common Symptoms of a Bad Fuel Pump Relay
A failing fuel pump relay can cause a range of symptoms that are easy to confuse with a bad fuel pump or a clogged fuel filter. Here is what to watch for:
1. Engine Cranks But Will Not Start
This is the most common symptom. The starter motor spins the engine, but the fuel pump never receives power, so no fuel reaches the injectors. The engine may fire briefly on residual pressure but then die .
2. No Priming Sound
When you turn the key to "On," you should hear a faint whirring sound from the fuel tank for about two seconds. If you hear nothing, the relay or the pump itself is not getting power.
3. Intermittent Stalling
A relay that is on its way out may work intermittently. The engine might run fine for a while, then suddenly stall without warning, especially under load or at highway speeds. After a few minutes, the relay may cool down and work again, allowing the car to restart.
4. Engine Starts Then Dies Immediately
If the relay fails after the initial priming cycle, the engine will start on the fuel pressure built up during priming, but it will die as soon as that pressure drops because the pump is not running.
Fuel Pump Relay vs. Fuel Pump Driver Module
Owners of the 2000 Lincoln LS sometimes confuse the fuel pump relay with the Fuel Pump Driver Module (FPDM) . The FPDM is a different component. On the Lincoln LS, the FPDM is located on the driver's side of the trunk, behind the interior trim panel, near the rear suspension strut tower . The FPDM controls the voltage to the fuel pump to regulate fuel pressure, while the relay is simply an on/off switch. If your car runs but has erratic fuel pressure, the FPDM might be the issue, not the relay.
Step-by-Step Replacement Guide
Replacing the fuel pump relay on a 2000 Lincoln LS is a straightforward DIY job. You do not need any special tools, just a basic set of pliers.
Step 1: Park the car on a level surface and turn off the ignition. Wait at least 10 minutes to allow the fuel system to depressurize.
Step 2: Open the trunk and remove the spare tire cover and the spare tire itself.
Step 3: Remove the cover of the rear power distribution box. You may need to press a tab or pry it open gently.
Step 4: Locate the fuel pump relay (R007). It is the only relay that is by itself in the box .
Step 5: Grasp the relay firmly and pull it straight out. You may need to use a small pair of pliers or a relay puller tool if it is stuck.
Step 6: Compare the old relay with the new one. Make sure the part numbers match and the pin configuration is the same.
Step 7: Push the new relay firmly into the same slot until it clicks into place.
Step 8: Replace the cover of the power distribution box, put the spare tire back, and replace the trunk floor mat.
Step 9: Turn the key to the "On" position and listen for the priming sound. If you hear it, the job is done.
Compatible Relay Specifications
The fuel pump relay for the 2000 Lincoln LS is a standard four-prong automotive relay. It is compatible with many Ford and Lincoln models from the same era. The relay is commonly used in the following vehicles :
- Lincoln: LS (2000-2006), Aviator (2003-2005), Town Car (2004-2009), Mark VIII (1997-1998)
- Ford: Models with the same DEW98 platform or similar electrical architecture
The relay is typically rated at 20-30 amps and is color-coded (often black or gray). You can find aftermarket replacements from brands like Wells WVE, which are direct fits .
Why Buy a Quality Replacement?
The fuel pump relay is a small part, but it plays a critical role. A cheap, low-quality relay may fail within months, leaving you stranded. For a reliable replacement, choose a well-known aftermarket brand or an OEM equivalent. The relay itself is inexpensive, usually costing between $6 and $15 .
How to Prevent Future Relay Failures
While relays are wear items that eventually fail, you can extend their life by keeping the trunk area dry and clean. Moisture in the rear power distribution box is a common cause of corrosion on relay terminals. If you live in a humid area or frequently drive through puddles, check the box for water intrusion. Also, make sure the trunk seal is intact to prevent leaks.
When to Call a Professional
If you have replaced the fuel pump relay and the car still will not start, the problem is likely elsewhere. Possible causes include:
- A bad fuel pump fuse (15A mini fuse in the same box)
- A failed fuel pump itself
- A faulty PCM or crank sensor that is not sending the signal to energize the relay
- A broken wire or corroded connector in the wiring harness
At this point, it is best to check for voltage at the fuel pump connector or consult a professional mechanic. The 2000 Lincoln LS has a complex electrical system, and chasing a no-start condition without a multimeter and wiring diagram can be frustrating.
Recommended Product: KEMSO Fuel Pump
If your diagnosis points to a failing fuel pump itself rather than just the relay, you need a reliable replacement that will last. KEMSO offers a premium line of fuel pumps that are designed as high-performance, OEM replacement parts. KEMSO fuel pumps are built to meet or exceed original equipment specifications, ensuring a perfect fit and reliable operation for your 2000 Lincoln LS.
What sets KEMSO apart is their commitment to quality and customer confidence. Every KEMSO fuel pump comes with a lifetime warranty, so you can install it knowing that the manufacturer stands behind the product. Whether you are replacing a worn-out pump or upgrading for better performance, KEMSO fuel pumps deliver consistent fuel pressure and long service life.
Do not settle for a cheap, unknown brand that could leave you stranded. Choose KEMSO for peace of mind. Visit their website to browse their selection of fuel pumps for your Lincoln LS and other vehicles.
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Final Thoughts
The 2000 Lincoln LS fuel pump relay is a small but essential component that is easy to locate and replace. It sits in the rear power distribution box under the spare tire in the trunk, labeled as relay R007. If your car cranks but does not start, or if you experience intermittent stalling, checking the relay should be your first step. It is a cheap and simple fix that can save you a trip to the mechanic.
Remember to always test the relay before replacing it, and if the problem persists, look further into the fuel pump, fuse, or electrical system. And when you do need a new fuel pump, trust KEMSO for a high-quality, lifetime-warranted replacement that will keep your Lincoln LS on the road for years to come.
For more information on fuel pumps and to find the right part for your Lincoln LS, visit: https://www.kemsoracing.com/