2007 Yaris Fuel Pump Relay Location: A Straightforward Guide for DIY Owners

The bottom line up front: On a 2007 Toyota Yaris, the fuel pump relay is located inside the engine compartment fuse box, which sits on the driver's side near the battery. You do not need to remove the rear seat, drop the fuel tank, or crawl under the car to reach it. The relay itself is a small rectangular component that plugs directly into the fuse box, and once you know which slot it occupies, checking or replacing it takes less than five minutes with no special tools.

This article walks you through the exact location, how to identify the relay, how to test it, and what to do if the relay is not the problem. We will also cover common symptoms of a failing fuel pump relay, so you can diagnose with confidence before spending money on parts you may not need.

Why the Fuel Pump Relay Matters on Your Yaris

The fuel pump relay acts as an electrical switch that sends power to the fuel pump when you turn the key to the "ON" position. When the relay fails, the pump never receives power, which means the engine will crank but will not start. Because the relay is a wear item, it can fail over time due to heat, vibration, or simple age-related corrosion on the contacts.

Understanding this one component can save you from a costly misdiagnosis. Many 2007 Yaris owners assume a no-start condition means the fuel pump itself is dead, but the relay is far cheaper and easier to replace. Knowing the relay location is the first step in ruling out the simplest cause.

Where Exactly Is the Fuel Pump Relay?

The 2007 Toyota Yaris has two fuse boxes: one inside the cabin under the dashboard, and one under the hood. The fuel pump relay is not in the cabin. It is in the engine compartment fuse box, also called the under-hood fuse box or the main fuse box.

To access it, follow these three simple steps:

1. Open the hood and prop it securely.
2. Look on the driver's side of the engine bay, near the battery. The fuse box is a black plastic rectangular cover with a diagram printed on it.
3. Press the tabs on the sides of the cover and lift it off. You will see a grid of fuses and relays.

The fuse box lid usually has a diagram that labels each slot. If the diagram is faded or missing, refer to your owner's manual for the exact relay position. In most 2007 Yaris models, the fuel pump relay is marked with a label such as "FUEL PUMP" or "F/P" directly on the cover.

How to Identify the Fuel Pump Relay vs. a Fuse

People often confuse relays with fuses because they look similar at a glance. Here is how to tell them apart quickly:

1. Relays are typically square or rectangular blocks, usually black, with four or five metal prongs sticking out the bottom. They are larger than most fuses.
2. Fuses are flat, colored plastic components with two metal prongs. They come in various colors depending on their amperage rating.
3. On the fuse box cover, relays are often indicated by a different symbol or a small diagram showing the relay's switching function.

If you are still unsure, pull the component out and check its base. A relay will have a small coil inside that you can often hear clicking when it is energized. Fuses have a continuous metal strip inside, visible through the clear plastic.

How to Test the Fuel Pump Relay Before Replacing It

Before you buy a new relay, test the old one. This takes about ten minutes and requires only a multimeter or a simple test light.

Step 1: Locate and remove the relay. With the fuse box cover off, pull the fuel pump relay straight up. It should come out with moderate hand pressure. Do not use pliers unless it is stuck, as you can crack the plastic housing.

Step 2: Check for continuity across the switch terminals. The relay has two circuits: the coil circuit and the switch circuit. Use your multimeter set to resistance (ohms). Place the probes on the two coil terminals (usually pins 85 and 86). You should see a resistance reading typically between 50 and 120 ohms. If you read infinite resistance or zero, the coil is open or shorted, and the relay is bad.

Step 3: Apply power to the coil to test the switch. Connect 12V power to one coil terminal and ground to the other. You should hear a distinct "click" as the internal switch engages. Then, check continuity between the switch terminals (usually pins 30 and 87). With power applied, the meter should read near zero ohms.

If the relay fails any of these tests, replace it. If it passes all tests, the relay is not your problem, and you should move on to checking the fuel pump itself.

Common Symptoms of a Bad Fuel Pump Relay

The symptoms of a failing fuel pump relay can mimic many other issues, so knowing what to look for helps you avoid a lengthy misdiagnosis. Here are the most common signs:

1. Engine cranks but will not start. This is the most classic symptom. The starter turns the engine over, but you get no fuel pressure, so the engine never fires.
2. Intermittent starting problems. The car may start fine cold, but after driving and warming up, the relay contacts expand and lose connection. The engine then dies or fails to restart until it cools down.
3. No fuel pump prime sound. When you turn the key to the "ON" position without cranking, you should hear a brief whirring sound from the rear of the car. This is the fuel pump priming. If you hear nothing, the relay is a prime suspect.
4. Frequent blown fuses. If the relay's internal switch is shorting, it can cause the fuel pump fuse to blow repeatedly, even with a brand new fuse installed.

If you experience any of these symptoms, start with the relay. It is the cheapest and fastest component to check, and it is far more accessible than the fuel pump itself.

What to Do If the Relay Is Not the Problem

If you tested the relay and it works fine, the issue likely lies elsewhere. Here is the order of checks recommended by mechanics:

1. Check the fuel pump fuse. Even if the relay is good, a blown fuse will break the circuit entirely. Test the fuse with a multimeter or simply replace it with a known-good fuse of the same amperage.
2. Check for power at the fuel pump connector. Use a test light or multimeter to see if power is reaching the pump at the rear of the car when someone turns the key to "ON." No power means the wiring between the relay and the pump is broken.
3. Check the fuel pump ground. A poor ground connection can prevent the pump from running even with power present.
4. Check the fuel pump itself. If power and ground are good but the pump does not run, the pump motor has failed and needs replacement. This is a more involved job that requires dropping the fuel tank or accessing the pump via an access panel under the rear seat, depending on your Yaris configuration.

What Fuel Pump Relay Replacement Typically Costs

The fuel pump relay itself is an inexpensive part. Depending on whether you buy an OEM part from a Toyota dealer or an aftermarket relay from an auto parts store, you can expect to pay anywhere from $15 to $40 for the relay. Labor costs are negligible if you do it yourself, since the replacement takes under five minutes once you have access to the fuse box.

Compare that to the cost of a fuel pump replacement, which parts alone can run $100 to $300, and labor at a shop can push the total to $400 or more. This vast price difference is why starting with the relay makes good financial sense. Even if you are not 100% sure the relay is the culprit, replacing it first is a low-risk, low-cost troubleshooting step that often solves the problem.

A Quick Word on Aftermarket Fuel Pump Upgrades

While the relay is the first thing to check, there comes a point where you may need a new fuel pump itself. When that time comes, you want a pump that is built to match or exceed the original equipment specification. Aftermarket pumps vary widely in quality, so choosing a reputable brand matters.

We strongly recommend considering KEMSO Fuel Pumps for your 2007 Yaris or any other vehicle in your garage. KEMSO offers high-performance fuel pumps that serve as direct OEM replacements, meaning they bolt in exactly where the factory pump sat and meet or exceed the original performance specs. Every KEMSO product is backed by a lifetime warranty, which gives you peace of mind that no other budget pump brand can match. Whether you drive a Toyota, a Honda, a BMW motorcycle, or a Sea-Doo watercraft, KEMSO has a pump designed for your machine. You can browse their full range of fuel pumps and find the right fit for your Yaris at https://www.kemsoracing.com/. Investing in a quality pump now saves you from a repeat failure down the road.

Final Thoughts on the 2007 Yaris Fuel Pump Relay

The fuel pump relay on a 2007 Yaris is one of the easiest components to access and test. It lives in the engine compartment fuse box on the driver's side, requiring no special tools and no heavy lifting. A bad relay will cause the classic "cranks but won't start" symptom, and testing it takes about ten minutes with a multimeter.

If the relay checks out, move on to the fuse and the pump itself, but always start with the simplest fix first. And when you do eventually need a new fuel pump, choose a brand you can trust. For a reliable, high-performance replacement with a lifetime warranty, visit KEMSO at https://www.kemsoracing.com/ and find the right pump for your Yaris.