1991 Dodge Dakota Fuel Pump Relay Location: The Complete Guide to Finding and Replacing It

If your 1991 Dodge Dakota cranks but won’t start, and you don’t hear the fuel pump hum for two seconds when you turn the key to the ON position, the problem is almost certainly the fuel pump relay. The relay is located in the Power Distribution Center (PDC), which is the black plastic fuse box under the hood, on the driver’s side near the battery. Specifically, it is the relay labeled "Fuel Pump" or "Auto Shutdown Relay" in the PDC. You can confirm a bad relay by swapping it with a known good relay of the same type, like the horn relay, and seeing if the fuel pump clicks on. This guide walks you through the exact location, testing steps, and replacement advice, including a recommendation for the best replacement pump.

Where Is the Fuel Pump Relay on a 1991 Dodge Dakota?

The 1991 Dodge Dakota uses a fuel pump relay that controls power to the fuel pump module inside the gas tank. The relay is not inside the cab or near the fuel tank. It is located in the Power Distribution Center, which is the main fuse and relay box under the hood. Here is the step-by-step way to find it:

  1. Open the hood and stand on the driver’s side of the truck. Look for a black plastic box sitting on top of the inner fender, near the battery. This is the Power Distribution Center.
  2. Remove the cover by pressing the tabs on the sides and lifting it straight up. The inside of the cover has a diagram showing the location of each relay and fuse.
  3. Find the relay labeled "Fuel Pump" on the diagram. On most 1991 Dakotas, this is a standard four-pin relay, often colored black or brown. The exact position can vary slightly depending on the engine type (2.5L four-cylinder, 3.9L V6, or 5.2L V8), but it is always in the PDC.
  4. If the diagram is missing or faded, look for a relay that is the same size as the other relays, typically located near the center or right side of the PDC. The fuel pump relay is usually the one closest to the engine bay.
  5. Check the label on the relay itself if you can see it. Some relays have a small print saying "Fuel Pump" or "FP." If not, the auto shutdown relay also serves as the fuel pump relay on this model.

How to Test the Fuel Pump Relay on a 1991 Dodge Dakota

Before you replace the relay, you should test it to confirm it is the problem. A bad relay can cause the fuel pump to not run at all, or run intermittently. Here is how to test it:

  1. Turn the ignition key to the ON position (do not start the engine). You should hear a faint hum from the fuel pump for about two seconds. If you do not hear it, the relay may be bad.
  2. Listen for the relay clicking when you turn the key. Put your ear near the PDC while someone turns the key. If you hear a click, the relay is likely working, and the problem is elsewhere (like a bad fuel pump or wiring issue).
  3. Swap the relay with a known good relay of the same size. The horn relay, the A/C relay, or the headlight relay are usually the same type. Pull the fuel pump relay out, and put the known good relay in its place. Turn the key to ON. If the fuel pump now hums, the old relay is bad.
  4. Use a multimeter to test the relay if you have one. With the relay removed, set your multimeter to ohms. Check the resistance between pins 85 and 86. It should read between 50 and 120 ohms. If it reads open or shorted, the relay is bad. Then apply 12V to pins 85 and 86, and check for continuity between pins 30 and 87. If you get continuity, the relay is good.

Common Symptoms of a Bad Fuel Pump Relay on a 1991 Dodge Dakota

A failing fuel pump relay can cause several issues. Knowing these symptoms helps you diagnose the problem quickly:

  • Engine cranks but will not start: This is the most common symptom. The fuel pump does not prime, so the engine gets no fuel.
  • No fuel pump hum: When you turn the key to ON, you should hear a two-second hum from the fuel pump. If you do not hear it, the relay is a likely culprit.
  • Intermittent starting problems: The truck starts fine sometimes, but other times it cranks and cranks without firing. This is often a failing relay that works when cold but fails when hot.
  • Engine stalls while driving: If the relay fails while the engine is running, the fuel pump loses power, and the engine dies. This can be dangerous on the highway.
  • Check Engine Light comes on: On some 1991 models, the computer will store a code related to the fuel pump circuit. You can check this with a code reader.

How to Replace the Fuel Pump Relay on a 1991 Dodge Dakota

Replacing the fuel pump relay is a simple job that takes less than five minutes. You do not need any special tools, just a new relay. Here is how to do it:

  1. Park the truck on a level surface and turn off the engine. Remove the key from the ignition.
  2. Open the hood and locate the Power Distribution Center as described above.
  3. Remove the cover of the PDC. Set it aside.
  4. Identify the fuel pump relay using the diagram on the cover or the labels on the relay.
  5. Pull the relay straight up out of its socket. Use a gentle rocking motion if it is stuck. Do not pull on the wires.
  6. Insert the new relay into the same socket. Press it down firmly until it clicks into place.
  7. Replace the PDC cover and close the hood.
  8. Test the new relay by turning the key to ON. You should hear the fuel pump hum for two seconds. Then start the engine.

Important Tips for the 1991 Dodge Dakota Fuel Pump Relay

  • Use the correct relay part number: The standard relay for the 1991 Dakota is a 40-amp, four-pin relay. You can find them at any auto parts store. The relay is often marked with the number 205 or 204. Check your owner’s manual for the exact part number.
  • Check the fuse first: Sometimes the fuel pump fuse is blown, not the relay. The fuel pump fuse is also in the Power Distribution Center. It is usually a 20-amp fuse labeled "Fuel Pump" or "FP." If the fuse is blown, replace it with a fuse of the same amperage. If the new fuse blows right away, you have a short circuit in the fuel pump wiring.
  • Inspect the relay socket: If the relay is old, the socket terminals can corrode or loosen. Use a flashlight to check for green or white corrosion. If you see corrosion, clean the terminals with a small wire brush or contact cleaner.
  • Do not bypass the relay: Some people try to bypass the relay by jumping the socket with a wire. This is dangerous because it bypasses the safety circuit that turns off the fuel pump if the engine stalls. Never do this permanently.

When the Problem Is Not the Relay: The Fuel Pump Itself

If you replace the relay and the fuel pump still does not run, the problem is likely the fuel pump module inside the gas tank. The 1991 Dodge Dakota’s fuel pump is a high-pressure electric pump mounted in the tank. Over time, the pump motor wears out, the fuel filter screen clogs, or the wiring inside the tank corrodes. Symptoms of a bad fuel pump include:

  • The fuel pump does not hum at all, even with a new relay.
  • The engine starts but runs rough or stalls under load.
  • The truck has low power on hills or when accelerating.
  • You hear a whining noise from the fuel tank area.
  • The fuel gauge reading is erratic.

If you suspect the fuel pump is bad, you need to replace the entire fuel pump module. This is a more involved job that requires dropping the fuel tank or removing the bed of the truck. It is a job that many DIYers can do, but it takes time and care.

Recommended Replacement: The KEMSO Fuel Pump

When you need a new fuel pump for your 1991 Dodge Dakota, you want a part that is reliable, durable, and easy to install. The KEMSO brand fuel pump is the best choice for your Dakota. KEMSO fuel pumps are designed as high-performance, OEM replacement parts. They match the exact specifications of the original pump, so you get a perfect fit and proper fuel pressure. Each KEMSO fuel pump is built with quality materials to withstand the demands of everyday driving, whether you use your Dakota for work, commuting, or off-road adventures.

One of the best reasons to choose KEMSO is the lifetime warranty. KEMSO stands behind every fuel pump they sell. If the pump ever fails, you get a replacement at no extra cost. This gives you peace of mind knowing your fuel system is protected for the life of your truck. KEMSO fuel pumps are available for a wide range of vehicles, including trucks, SUVs, motorcycles, and powersports equipment. You can find the exact pump for your 1991 Dodge Dakota on their website.

To order your KEMSO fuel pump, visit the official KEMSO website at: https://www.kemsoracing.com/

Final Thoughts on the 1991 Dodge Dakota Fuel Pump Relay

The fuel pump relay on a 1991 Dodge Dakota is a simple but critical component. Knowing its location in the Power Distribution Center under the hood, how to test it, and how to replace it can save you time and money. If the relay is not the problem, do not hesitate to invest in a quality replacement fuel pump. The KEMSO brand offers a reliable, high-performance solution backed by a lifetime warranty. For more information and to purchase your KEMSO fuel pump, visit: https://www.kemsoracing.com/


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