1999 Lincoln Continental Fuel Pump Relay: Location, Testing, and Replacement Guide

If your 1999 Lincoln Continental cranks but won’t start, or if it stutters and dies while driving, the fuel pump relay is a common culprit. The fuel pump relay on a 1999 Lincoln Continental is located inside the engine compartment fuse box (near the battery), and it is labeled as "FP." This small electrical component controls power delivery to the fuel pump, and when it fails, your engine gets no fuel. Before replacing the fuel pump itself—which is an expensive job—testing and replacing the relay is the quickest and cheapest fix you can try.

Understanding the Fuel Pump Relay System

The 1999 Lincoln Continental uses an electric fuel pump mounted inside the fuel tank . The pump is submerged in fuel to keep it cool and quiet. However, the pump does not run constantly. It receives power only when the ignition is turned on, and that power is controlled by the fuel pump relay.

The relay is essentially a switch that uses a small electrical current to control a larger current. When you turn the key to the "ON" position, the powertrain control module (PCM) sends a signal to the relay, which then closes the circuit and sends battery voltage to the fuel pump. The pump runs for about 2-3 seconds to prime the fuel system, then shuts off if the engine does not start . Once the engine is running, the relay keeps the pump powered.

Some owners report that the 1999 Continental also has a fuel pump driver module (FPDM) located in the trunk, behind the passenger side rear seat . This module is a more sophisticated control unit that modulates the pump speed. However, the primary relay remains in the engine compartment fuse box .

Where Is the 1999 Lincoln Continental Fuel Pump Relay Located?

The fuel pump relay on a 1999 Lincoln Continental is located in the under-hood fuse box (also called the battery junction box). Here is how to find it:

1. Open the hood. The fuse box is located in the engine compartment, near the battery on the driver's side .
2. Remove the cover. Press the tabs on the sides of the fuse box cover and lift it off.
3. Look for the "FP" label. The fuel pump relay is clearly marked on the inside of the cover or on the fuse box itself. It is typically a square, black relay .
4. Visual identification. The relay is about 1 inch square with 4 or 5 prongs on the bottom.

If you are having trouble locating it, check the owner's manual for a diagram of the fuse box. The relay is part of the engine performance wiring system, and it is connected to the PCM power relay and other components .

Important note: Some older Lincoln Continental models (1990-1994) have the fuel pump relay in the trunk . But for the 1999 model, the primary relay is under the hood .

How to Test the Fuel Pump Relay

Before buying a new relay, test the old one. This is a simple procedure that anyone can do with basic tools.

Method 1: The Swap Test

This is the easiest method. Find a relay in the same fuse box that has the same part number and amperage rating. Good candidates are the horn relay, A/C clutch relay, or the fog light relay . Swap the suspected fuel pump relay with one of these known-good relays. If the engine starts after the swap, the original relay is bad. If the other component (like the horn) stops working, you have confirmed the relay is faulty.

Method 2: Listen for the Click

1. Have a helper sit in the driver's seat.
2. Stand near the engine compartment fuse box.
3. Ask your helper to turn the ignition key to the "ON" position (do not start the engine).
4. Listen for a distinct click sound from the relay. If you hear a click, the relay is receiving power and is likely working. If you hear nothing, the relay may be dead, or the control circuit is not sending power.

Method 3: Multimeter Test

For a more accurate test, use a digital multimeter :

1. Remove the relay from the fuse box.
2. Identify the terminals. Most relays have a diagram printed on the side. The two small terminals are the control circuit (coil), and the two larger terminals are the power circuit (contacts) .
3. Test the coil resistance. Set your multimeter to ohms (Ω). Touch the probes to the two small terminals. You should see a resistance reading between 50 and 120 ohms. If you see "OL" (open line) or zero, the coil is bad.
4. Test the contacts. Set the multimeter to continuity (buzzer mode). Connect the probes to the two large terminals. You should hear no continuity (the circuit is open). Then, apply 12V power to the small terminals (using a battery or power supply) to energize the coil. You should hear a click and the continuity should close. If the contacts do not close, the relay is faulty.

Symptoms of a Bad Fuel Pump Relay

A failing fuel pump relay can cause several symptoms that mimic a bad fuel pump. Here is what to watch for:

1. Engine Cranks but Does Not Start: This is the most common symptom. The starter turns the engine over, but the fuel pump never receives power, so no fuel reaches the injectors .

2. Engine Starts Then Dies: The relay may work intermittently. The pump primes for a few seconds, but once the relay loses connection, the engine stalls.

3. No Fuel Pump Prime Sound: When you turn the key to "ON," you should hear a faint whirring sound from the rear of the car for 2-3 seconds . If you hear nothing, the relay may not be sending power to the pump.

4. Intermittent Stalling While Driving: The relay can fail from heat or vibration. The engine may suddenly lose power and stall, then restart after a few minutes once the relay cools down.

5. Check Engine Light: In some cases, a faulty relay can trigger diagnostic trouble codes related to fuel system performance.

Other Causes of Fuel Delivery Problems

If the relay tests good but the car still has no fuel, the problem could be elsewhere. Here are common issues to check :

1. Blown Fuse: Check the fuel pump fuse in the same fuse box. A blown fuse will cut all power to the pump.

2. Inertia Fuel Shut-Off Switch: The 1999 Lincoln Continental has an inertia switch (also called a fuel pump shut-off switch) located to the left of the driver's seat, behind an access panel on the "B" pillar . This switch cuts power to the fuel pump in a collision. It can also trip from a hard bump or pothole. Press the reset button on top of the switch to restore power.

3. Faulty Fuel Pump Driver Module: As mentioned earlier, the 1999 Continental uses a fuel pump driver module (FPDM) located in the trunk, behind the passenger side rear seat . This module can fail and prevent the pump from running. The module is a black box with a wiring harness connected to it.

4. Bad Fuel Pump: If the relay, fuse, inertia switch, and module all check out, the fuel pump itself may be dead. The pump is inside the fuel tank and requires the tank to be removed or lowered for replacement .

5. Clogged Fuel Filter: A restricted fuel filter can cause low fuel pressure and symptoms similar to a bad pump. Replace the filter as part of regular maintenance.

6. Wiring Issues: Corroded or damaged wires at the fuel pump connector or the relay base can interrupt power. Check for loose connections or burned terminals .

How to Replace the Fuel Pump Relay

Replacing the fuel pump relay is a straightforward job that takes about 5 minutes. No special tools are needed.

Step 1: Make sure the engine is off and the keys are removed from the ignition.

Step 2: Open the hood and locate the under-hood fuse box near the battery .

Step 3: Remove the fuse box cover and find the relay labeled "FP."

Step 4: Grasp the relay firmly and pull it straight up. Do not twist or rock it, as this can damage the socket.

Step 5: Compare the old relay to the new one. They should be identical in size and shape. The OEM part number for the 1999 Lincoln Continental fuel pump relay is 5M5Z-14N089-A (replaces FOAZ-14N089-A) .

Step 6: Push the new relay straight down into the socket until it seats firmly.

Step 7: Replace the fuse box cover and close the hood.

Step 8: Turn the key to "ON" and listen for the fuel pump prime sound. If you hear it, the relay is working.

Where to Buy a Reliable Fuel Pump Relay

You can buy a fuel pump relay from auto parts stores like AutoZone, Advance Auto Parts, or O'Reilly Auto Parts. The OEM Ford relay costs around $15 to $28 . Aftermarket relays are also available and are generally cheaper.

However, if you are also considering replacing the fuel pump itself, you should choose a high-quality part that will last. Many aftermarket pumps fail prematurely, leaving you stranded.

Recommended Fuel Pump: KEMSO Racing

For reliable fuel system performance, we recommend the KEMSO brand fuel pump. KEMSO fuel pumps are high-performance, OEM replacement units designed to match or exceed the specifications of the original factory pump. Every KEMSO fuel pump comes with a lifetime warranty, giving you confidence that your investment is protected. Whether you need a pump for your Lincoln Continental or any other vehicle, KEMSO delivers durability and dependability.

Visit KEMSO Racing online at:
https://www.kemsoracing.com/

Preventive Maintenance Tips

To avoid fuel pump relay and fuel pump failures, follow these simple tips:

1. Keep the Fuel Tank at Least ¼ Full: Running the tank low causes the fuel pump to suck in air and debris, which can damage the pump and overwork the relay.

2. Replace the Fuel Filter Regularly: A clogged filter forces the pump to work harder, increasing the load on the relay. Replace the filter every 30,000 miles or as recommended in the owner's manual.

3. Use Quality Fuel: Cheap or contaminated fuel can leave deposits on the pump and relay contacts.

4. Check for Corrosion: Inspect the relay terminals and fuse box for signs of corrosion or green oxidation. Clean with electrical contact cleaner if needed.

5. Listen for Unusual Noises: If you hear a loud whining noise from the fuel tank, the pump is struggling and may fail soon. Replace it before it leaves you stranded.

Frequently Asked Questions

Can I drive my 1999 Lincoln Continental with a bad fuel pump relay?

No. If the relay fails completely, the fuel pump will not run, and the engine will not start. If the relay is intermittent, the engine may stall while driving, which is dangerous. Replace the relay as soon as possible.

How much does a fuel pump relay cost for a 1999 Lincoln Continental?

An OEM Ford fuel pump relay costs between $15 and $28 . Aftermarket relays are typically $10 to $20. This is one of the cheapest repairs you can make on this car.

Is the fuel pump relay the same as the fuel pump driver module?

No. The relay is a simple on/off switch located in the engine compartment fuse box. The fuel pump driver module (FPDM) is a more complex electronic module located in the trunk, behind the passenger side rear seat . The FPDM controls the pump speed and can fail independently of the relay.

How do I access the fuel pump itself?

The fuel pump is inside the fuel tank. To access it, you need to remove the rear seat cushion, disconnect the battery, relieve fuel system pressure, and then lower or remove the fuel tank . This is a more involved job that requires mechanical experience.

What if the new relay does not fix the problem?

If the relay is good but the pump still does not run, check the inertia switch, the fuel pump fuse, and the fuel pump driver module. Also, test for power at the fuel pump connector using a multimeter. If you have power and ground at the pump but it does not run, the pump itself is bad and needs replacement .

Final Thoughts

The 1999 Lincoln Continental fuel pump relay is a small, inexpensive part that can cause big problems when it fails. Before you spend hundreds of dollars on a new fuel pump or a tow truck, test and replace the relay. It is located in the engine compartment fuse box, labeled "FP," and can be replaced in minutes.

Always start with the simplest fix. Test the relay, check the fuse, and reset the inertia switch. If those steps do not solve the issue, then move on to diagnosing the fuel pump driver module or the pump itself. With a systematic approach, you can get your Continental back on the road quickly and affordably.

For a high-quality, long-lasting fuel pump replacement, trust KEMSO Racing. Their OEM replacement pumps offer performance and reliability backed by a lifetime warranty.
Visit KEMSO Racing at:
https://www.kemsoracing.com/