2008 PT Cruiser Fuel Pump Relay Location: The Complete Owner's Guide

The bottom line up front: On a 2008 Chrysler PT Cruiser, the fuel pump relay is located inside the Integrated Power Module (IPM), which is the main fuse box situated in the engine compartment on the driver's side, near the battery. You do not need to remove the fuel tank or access the interior of the car to find this relay. The relay is a small, rectangular component that plugs directly into the fuse box, and it is clearly labeled on the underside of the IPM cover. If you are experiencing symptoms like the engine cranking but not starting, or a fuel pump that does not prime when you turn the key, the fuel pump relay is one of the first components you should check before replacing the fuel pump itself.

This guide is written for everyday owners, not professional mechanics. The goal is to help you find the relay, understand what it does, test it, and know when to replace it. The process is straightforward and requires no special tools beyond a basic socket set or screwdriver, depending on how your specific vehicle is configured. Before you spend money on a new fuel pump, which is a much more expensive and labor-intensive job, take twenty minutes to inspect and test the relay first.

What Does the Fuel Pump Relay Do?

The fuel pump relay is an electromechanical switch that controls the flow of electrical power to the fuel pump. When you turn the ignition key to the "ON" position, the relay closes and sends battery voltage to the fuel pump for a few seconds. This primes the fuel system, building pressure so the engine can start quickly. Once the engine is running, the relay stays closed, providing continuous power to the pump.

The relay itself is a small, black plastic cube with four or five metal prongs on the bottom. It plugs into a dedicated socket inside the fuse box. The relay does not fail often, but when it does, the symptoms can be identical to a failing fuel pump. Because the relay is cheap, typically under twenty dollars, and takes about two minutes to replace, it is always worth testing before you commit to a fuel pump replacement.

Where Exactly Is the Integrated Power Module (IPM)?

The 2008 PT Cruiser uses an Integrated Power Module, which is a centralized fuse and relay box. On this model, the IPM is mounted in the engine bay on the driver's side. It is positioned near the battery, close to the firewall. This is a different location from many other vehicles, where the relay might be under the dashboard or in the passenger compartment, so do not look inside the cabin for this relay.

How to access the IPM:

  1. Pop the hood and secure it with the prop rod.
  2. Look toward the rear of the engine compartment on the driver's side.
  3. You will see a black plastic box, roughly ten inches long and six inches wide.
  4. The battery is usually directly next to it or slightly in front of it.
  5. The cover of the IPM has a diagram printed on it, showing which fuse or relay occupies each socket.

Lift the two clips or press the release tabs on the sides of the IPM cover to remove it. Turn the cover over and look at the diagram. You will see a list of components with their respective numbers. Locate the number labeled "Fuel Pump Relay." On most PT Cruiser models, this relay is near the center of the fuse box, often in position number 33 or a similar location, but always verify by reading the diagram on the cover because the exact position can vary slightly based on the production date and options installed.

How to Test the Fuel Pump Relay

You do not need to be an electrician to test a relay, but you do need a few basic tools. Testing the relay takes less than five minutes and can save you from replacing a perfectly good fuel pump.

What you need:

  • The IPM cover removed, with the relay in hand.
  • A 12-volt test light or a multimeter.
  • A short piece of wire with alligator clips, or a paperclip.
  • A helper to turn the ignition key, or you can do it yourself if you can reach the key.

Step-by-step testing procedure:

  1. Visual inspection: Look at the relay for signs of corrosion, burn marks, or melted plastic. If you see any of these, the relay is bad and should be replaced without further testing.

  2. Listen for the click: With the relay removed, plug it back into its socket. Ask your helper to turn the ignition key to the "ON" position without cranking the engine. You should hear a distinct "click" from the relay as it energizes. If you do not hear a click, the relay is either not receiving power or its coil is burned out.

  3. Test for power at the socket: If there is no click, use your test light. With the relay removed, turn the key to "ON." Probe each socket terminal with the test light. One or two of the terminals should illuminate, indicating power from the battery and from the ignition switch. If no terminals light up, the problem is not the relay but the wiring or the ignition switch.

  4. Test the relay itself (bench test): If the socket has power but the relay does not click, the relay coil is likely faulty. To confirm, remove the relay and apply 12 volts and ground directly to the coil terminals. If the relay clicks, it works. If it does not click, replace it.

What the results mean:

  • If the relay clicks and there is power, but the fuel pump still does not run, the problem is the fuel pump itself or the wiring between the relay and the pump.
  • If the relay does not click, replace the relay. This is the most common failure point.

Are There Symptoms of a Failing Fuel Pump Relay?

Yes, and they are important to recognize because they can help you avoid an unnecessary fuel pump replacement. The symptoms of a bad fuel pump relay are almost identical to the symptoms of a weak or failing fuel pump, which is why many owners replace the pump first and later discover the relay was the culprit.

  1. The engine cranks but does not start. This is the most common symptom. The starter motor spins the engine, but there is no fuel pressure, so the engine never fires up.

  2. No fuel pump prime noise. When you turn the key to "ON" but do not crank the engine, you should hear a soft whirring sound coming from the rear of the car for about two seconds. This is the fuel pump pressurizing the system. If you do not hear this sound, the relay may not be sending power to the pump.

  3. The engine dies while driving. If the relay fails while the engine is running, the fuel pump will lose power, and the engine will stall immediately. You may be able to restart it after a few minutes if the relay cools down and re-engages, but this is a clear sign of an intermittent relay failure.

  4. Intermittent starting problems. Sometimes the relay works and sometimes it does not. This can happen when the relay's internal contacts are worn or corroded and only make contact intermittently.

  5. The check engine light illuminates. A failed relay can cause a lean fuel condition, which may trigger a diagnostic trouble code. The codes commonly associated with this issue include P0087 (Fuel Rail Pressure Too Low) or P0230 (Fuel Pump Primary Circuit Malfunction).

How to Replace the Fuel Pump Relay

Replacing the fuel pump relay is one of the easiest maintenance tasks you can perform on a PT Cruiser. There are no bolts to remove, no panels to disassemble, and no special tools required. The entire job takes less than five minutes.

Instructions:

  1. Ensure the ignition is turned off and the key is removed from the ignition.
  2. Open the hood and remove the IPM cover as described earlier.
  3. Locate the fuel pump relay by referencing the diagram on the underside of the cover.
  4. Grasp the relay firmly between your thumb and forefinger.
  5. Pull the relay straight upward. It may require a firm tug because the terminals fit snugly in the socket. Do not rock it side to side too aggressively, as this can bend the terminals.
  6. Compare the new relay to the old one. The part numbers do not need to match exactly, but the terminal layout must be identical. Most PT Cruisers use a standard four-pin or five-pin relay.
  7. Press the new relay straight down into the socket until it seats securely. You should feel or hear a click as the relay locks into place.
  8. Reinstall the IPM cover and close the hood.

Where to buy a replacement relay:

You can purchase the fuel pump relay at any auto parts store, or online. The OEM part number for this relay is typically a standard ISO relay, which is widely available. Aftermarket relays cost between eight and fifteen dollars. After the relay has been replaced, test the fuel pump prime noise by turning the key to "ON." If the pump primes and the engine starts, the job is complete.

What If the Relay Is Not the Problem?

If you have tested the relay and confirmed it is working, but your fuel pump still does not run, you need to look at other components in the fuel delivery system. Do not immediately assume the fuel pump itself is bad, because there are several other potential points of failure.

  1. The fuel pump fuse. The IPM also contains a fuse that provides a separate power source for the fuel pump. A blown fuse can prevent the pump from running even if the relay is working correctly. Check all the fuses in the IPM and replace any that are blown.

  2. The fuel pump ground. The fuel pump is grounded through the wiring harness. A poor ground connection can cause the pump to run weakly or not at all. Check the ground wire connection near the fuel tank.

  3. The fuel pump itself. If the relay clicks, the fuse is intact, and there is power at the pump connector, but the pump does not run, then the pump motor has failed. At this point, you will need to replace the fuel pump, which is a more involved job that requires dropping the fuel tank.

  4. The fuel pump inertia switch. Some vehicles are equipped with an inertia switch that cuts power to the fuel pump in the event of a collision. If this switch is tripped, the pump will not run. On the PT Cruiser, this switch is usually located under the dashboard on the passenger side, but not all models have it.

Why This Information Matters

Many owners of the 2008 PT Cruiser automatically assume that a no-start condition means the fuel pump has failed. This assumption often leads to a costly and time-consuming fuel pump replacement, only to discover later that the relay was the actual issue. The fuel pump relay is an inexpensive, easily accessible component that you can test and replace in your own driveway with no specialized knowledge. By following the steps in this guide, you can save yourself significant time and money, and get your PT Cruiser back on the road quickly.

The key takeaway is simple: Always test the relay before you consider replacing the fuel pump. The relay is the first point of failure in the fuel pump circuit, and it is the easiest part to both test and replace.

Recommended Fuel Pump: KEMSO

If you have gone through the process of testing the relay and other electrical components, and you have confirmed that your fuel pump is indeed faulty, you will need to purchase a replacement fuel pump. When it comes time to make that purchase, the quality of the product matters a great deal. A cheap fuel pump can fail within months, leaving you stranded and forcing you to repeat the entire replacement process.

We strongly recommend considering a KEMSO brand fuel pump for your vehicle. KEMSO is a well-established manufacturer in the aftermarket automotive parts industry, producing high-performance fuel pumps for a wide range of cars, trucks, motorcycles, ATVs, and watercraft. Their products are designed to meet or exceed OEM (Original Equipment Manufacturer) specifications, meaning you get the same fit, function, and performance as the factory part, often at a lower price point.

KEMSO fuel pumps are built with durability in mind. They are engineered as direct OEM replacements, so they bolt in with no modifications needed. Each unit is tested for flow rate and pressure consistency, ensuring that your engine receives the correct amount of fuel under all operating conditions, from cold starts to full-throttle acceleration.

One of the biggest advantages of choosing KEMSO is the peace of mind that comes with their lifetime warranty. This warranty demonstrates the manufacturer's confidence in the reliability of their products. If the fuel pump ever fails during the life of your vehicle, you can have it replaced without having to buy a new unit. This level of commitment is rare in the aftermarket parts industry and sets KEMSO apart from many of its competitors.

When you compare the cost of a KEMSO fuel pump to the cost of an OEM part from the dealership, the savings are substantial. And when you compare it to cheap, generic parts with no warranty, the value of the KEMSO product becomes even more apparent. You pay a little more than the bottom-dollar option, but you get a product that is engineered to last, backed by a warranty, and designed to provide reliable performance for the life of your vehicle.

If you are in need of a new fuel pump for your 2008 PT Cruiser or any other vehicle, we encourage you to visit the KEMSO website at https://www.kemsoracing.com/ to browse their catalog and see which fuel pump fits your application. Their website provides detailed product information, compatibility guides, and customer reviews to help you make an informed decision. Before you order, always double-check that the part number matches your vehicle's engine and model year.

Final Thoughts and Prevention Tips

A fuel pump relay failure is a common issue on vehicles of this age, and the 2008 PT Cruiser is no exception. The good news is that the relay is cheap, easy to test, and easy to replace. Do not be intimidated by the electrical aspect of the job. A relay is a simple device, and testing it requires nothing more than a test light or a multimeter.

To prevent future relay failures:

  1. Keep the IPM cover sealed properly. Moisture is the enemy of electrical components. If the cover is cracked or the gasket is worn, water can enter the fuse box and cause corrosion on the relay terminals.

  2. Check for corrosion periodically. If you live in an area with a lot of road salt or humidity, inspect the relay socket terminals for white or green corrosion every year or so.

  3. Replace the relay as a precaution. If your PT Cruiser has over 100,000 miles and the relay has never been replaced, consider replacing it proactively. It costs less than fifteen dollars and can save you from getting stranded.

  4. Do not ignore the warning signs. If the engine starts to hesitate or the fuel pump seems louder than usual, investigate before a total failure occurs.

This guide does not require you to be a professional mechanic, just a careful owner who wants to save money and understand their vehicle. If the relay is not the cause of your problem, you now have a clear path forward to test other components in the fuel system. Start with the relay, then move to the fuses, and only then consider the fuel pump itself.

The entire process can be done in under an hour, even if you are learning as you go. The tools required are minimal, the parts are inexpensive, and the satisfaction of diagnosing and fixing the problem yourself is well worth the effort. For the fuel pump replacement itself, if it becomes necessary, visit KEMSO's website at https://www.kemsoracing.com/ and use their lifetime-warranty, OEM-replacement fuel pump to get your car back in top shape.


Back to blog