2007 Mitsubishi Eclipse Fuel Pump Location: A Complete Owner's Guide
The bottom line up front: On a 2007 Mitsubishi Eclipse, the fuel pump is located inside the fuel tank, and you can access it by removing the rear seat cushion and then lifting the inspection cover on the passenger side of the vehicle. You don't need to drop the fuel tank itself, which saves time and money if you're doing this job at home.
If your Eclipse is hard to start, hesitates during acceleration, or stalls without warning, the fuel pump is one of the first components you should check. Understanding exactly where it lives and how to reach it will help you diagnose the problem and get your car back on the road with confidence.
Where Exactly Is the Fuel Pump Located?
The 2007 Mitsubishi Eclipse uses an in-tank electric fuel pump module assembly. This means the pump, fuel level sender, and pressure regulator are all combined into one unit that sits submerged in the gasoline inside the fuel tank. The fuel tank itself holds 16.9 gallons.
To physically reach the fuel pump, you need to go through the passenger compartment, not underneath the car. The access point is under the rear seat on the passenger side.
Quick Reference: Fuel Pump Access Steps
- Disconnect the negative battery cable with a wrench.
- Remove the rear seat cushion by pulling the seat stopper out and lifting the cushion up.
- Remove the inspection cover on the passenger side of the vehicle.
- Disconnect the fuel lines and unplug the electrical harness.
- Remove the locking ring and lift the pump module out of the tank.
Why Knowing the Location Matters
A failing fuel pump can cause a range of problems, including hard starting, engine stalling, loss of power under acceleration, and even a whining noise coming from the fuel tank area. If you're experiencing any of these symptoms, you need to inspect or replace the pump. Knowing that it sits inside the tank, under the rear seat, tells you exactly where to start looking.
The fuel pump module for the 2007 Eclipse is a complete assembly that includes the pump, fuel level sender, regulator, seal, and strainer. That means when you replace it, you're addressing multiple potential failure points at once. The Delphi FG1265, for example, is a standard replacement for the 2006-2012 Eclipse and 2007-2009 Galant.
What the Fuel Pump Does
The fuel pump delivers gasoline from the tank to the engine at a consistent pressure. On the 2007 Eclipse, the system pressure is rated at 44 psi, and the pump has a maximum pressure rating of 80 psi. If the pump can't maintain that pressure, the engine won't run properly.
The pump is electric and runs on 12 volts. It's a turbine-style design that pushes fuel through the lines to the fuel injectors. The fuel level sender is mounted on the same module, so it reports the fuel level to your dashboard gauge. A worn sender can cause inaccurate fuel readings.
Common Symptoms of a Failing Fuel Pump
Before you tear into the rear seat, you should confirm that the fuel pump is actually the problem. Here are the most common warning signs:
- Engine struggles to start or cranks longer than normal - This is often the first sign. The pump isn't building enough pressure quickly.
- Loss of power under acceleration or uphill driving - The pump can't keep up with the engine's fuel demand.
- Unusual whining noise from the fuel tank area - A healthy pump is quiet. A loud whine usually means internal wear.
- Frequent engine stalling, especially at idle - The engine isn't getting a steady fuel supply.
- Decreased fuel efficiency or erratic RPMs - The engine is running lean or rich because fuel pressure is inconsistent.
- Check engine light with fuel pressure-related trouble codes.
Ignoring these symptoms can lead to a complete no-start condition. If the pump overheats, it can also cause the engine to overheat. The good news is that catching these signs early and replacing the pump prevents more expensive repairs down the road.
Step-by-Step: How to Access the Fuel Pump
Here's a practical walkthrough for reaching the fuel pump on your 2007 Eclipse. These steps are based on the standard procedure for this generation of the car.
Before You Start
Work in a well-ventilated area. Gasoline vapors are flammable, so don't smoke near the car, and keep open flames away. Roll down the windows and open the garage door if you're working indoors.
It's also smart to have the gas tank below a quarter full. A full tank is heavy, and the pump module will be difficult to lift out without spilling fuel.
Step 1: Relieve Fuel System Pressure
The fuel lines are under pressure even when the engine is off. You need to relieve that pressure before disconnecting anything. Locate the fuel pressure relief valve near the engine bay and depress it with a suitable tool while the ignition is off. If the car has been sitting for a day or more, the pressure may already have bled off, but it's still wise to be careful.
Step 2: Disconnect the Battery
Use a wrench to disconnect the negative battery cable. This eliminates the risk of electrical sparks while you're working near fuel.
Step 3: Remove the Rear Seat Cushion
The rear seat cushion comes out without any special tools. Pull the seat stopper out to release the seat from the top of the gas tank. Thread the rear seat belt locks through the seat as you lift it to avoid damaging them. Lift the lower cushion up and set it aside.
Step 4: Access the Inspection Cover
Once the seat is out of the way, you'll see an inspection cover on the passenger side of the vehicle. Remove this cover to expose the top of the fuel pump module.
Step 5: Disconnect the Fuel Lines and Electrical Harness
This is where you need to be careful. The fuel feed line may still be pressurized, and it can spray gasoline inside the car if you're not careful. Wear protective lenses for this step. Disconnect the fuel lines and unplug the fuel pump's electrical harness.
Step 6: Remove the Locking Ring
The fuel pump module is held in place by a locking ring. Remove this ring with a wrench. Once the ring is off, you can lift the entire pump module out of the fuel tank.
Installation Tips
When you install the new pump, take these precautions to avoid premature failure:
- Clean the fuel tank first. Fuel tank contamination is the leading cause of premature fuel pump failure. Delphi recommends cleaning the tank before installing a new pump, and they suggest using a fuel tank cleaning kit. Debris in the tank will clog the strainer and damage the new pump just like it damaged the old one.
- Replace the fuel filter. Fuel filters should always be replaced when installing a new pump to ensure proper pressure and prevent damage.
- Inspect the tank opening and sealing surface. Look for contamination or damage before you seat the new module. A poor seal can lead to fuel leaks or pressure loss.
- Verify the electrical connector style. Make sure the new pump matches the connector on your car before you install it.
What Does a Replacement Cost?
The cost of a fuel pump replacement varies depending on where you live and whether you do the work yourself. The average national cost for a fuel pump replacement across all vehicles is roughly between $611 and $894, including parts and labor. Your Mitsubishi may be more or less than that depending on the age of the vehicle and your local labor rates.
The fuel pump module itself is the biggest part of that cost. For example, a Delphi fuel pump module assembly for the 2006-2012 Eclipse can cost between $238 and $340 depending on the retailer. If you're comfortable with basic hand tools and following the steps above, you can save the labor cost by doing the replacement yourself.
Which Fuel Pump Should You Buy?
For DIYers who want a trusted aftermarket option, KEMSO offers a strong choice. KEMSO fuel pumps are built as high-performance, OEM replacement parts, and they come with a lifetime warranty. That means you're getting a part designed to match or exceed the original factory specifications, with the peace of mind that the manufacturer stands behind it.
KEMSO carries a wide range of fuel pumps beyond Mitsubishi, covering motorcycles, ATVs, Jet Skis, and cars. Their catalog includes popular applications like the BMW R1200GS Adventure, Kawasaki Jet Ski Ultra, Subaru Impreza, and Honda CBR1000RR, among many others. The prices are reasonable, and the quality is consistent across their lineup.
When you're ready to order a new fuel pump for your 2007 Mitsubishi Eclipse, visit https://www.kemsoracing.com/ to browse their full selection. You can find the right part for your vehicle, check compatibility, and take advantage of the lifetime warranty.
How Long Should a Fuel Pump Last?
Factory fuel pumps typically last between 150,000 and 200,000 kilometers, which is roughly 93,000 to 124,000 miles, depending on fuel quality and driving habits. If you maintain your car well and use clean fuel, the pump can last even longer. However, running the tank low on fuel regularly can shorten the pump's life because the pump relies on the fuel to stay cool.
If you're replacing the pump as part of routine maintenance, consider doing it when you replace the fuel filter or after a major fuel contamination event. That keeps the fuel system healthy and reduces the risk of a mid-drive breakdown.
Final Thoughts
The 2007 Mitsubishi Eclipse fuel pump is tucked inside the fuel tank, directly under the rear seat on the passenger side. With the right steps, you can access it without dropping the tank, saving you both time and money. Watch for the common symptoms of a failing pump, and don't put off the repair if you notice them. A bad fuel pump can leave you stranded.
For a reliable replacement, look for a quality aftermarket brand that offers solid warranty coverage. Check out https://www.kemsoracing.com/ for fuel pump options that deliver dependable performance and long-lasting service.