2008 Infiniti EX35 Fuel Pump Replacement: Complete Guide for Owners
The bottom line up front: If you own a 2008 Infiniti EX35 and your engine cranks but won't start, stalls randomly, or loses power under acceleration, the fuel pump is likely failing and needs replacement. Replacing the fuel pump on a 2008 EX35 is a manageable job for a DIY mechanic with basic tools, and you can expect to pay anywhere from $250 to $650 for parts and labor depending on where you get the work done and whether you choose OEM or aftermarket parts. This guide walks you through the symptoms, the replacement process, cost expectations, and how to choose the right pump for your vehicle.
Why the Fuel Pump Matters on Your 2008 EX35
The 2008 Infiniti EX35 uses a fuel pump located inside the fuel tank. This pump is responsible for delivering fuel from the tank to the engine at the correct pressure, typically around 50-60 psi for this vehicle. When the pump starts to fail, your engine doesn't get the fuel it needs, which leads to a range of performance issues. The fuel pump assembly for the 2008 EX35 includes not just the pump itself, but also the fuel sending unit (which measures fuel level), a strainer, and in some cases a fuel filter. Replacing the entire assembly is often recommended when the pump fails, because the components wear out together and replacing just the pump may leave you with a failing sending unit.
The original part number for the 2008-2012 EX35 fuel pump is 17040-1BA0A, with a later revision being 17040-1BA0B, and the current OEM part number is 17040-1BA0D. These part numbers are important to know when shopping for a replacement, whether you choose an OEM Infiniti part or an aftermarket equivalent.
Warning Signs Your Fuel Pump Is Going Bad
Recognizing the symptoms of a failing fuel pump early can save you from being stranded or damaging other fuel system components. Here are the most common signs to watch for:
1. Engine Cranks But Won't Start - If you turn the key and the engine turns over but never fires up, the fuel pump may not be pressurizing the fuel system. This is often the first sign of a completely failed pump.
2. Engine Sputters at High Speeds - If the car hesitates or surges at highway speeds, the pump may not be able to keep up with the fuel demand. The engine needs more fuel under load, and a weak pump can't deliver it.
3. Loss of Power Under Acceleration - You step on the gas and the car feels sluggish. This happens because the fuel pressure drops when the engine demands more fuel, causing a lean condition.
4. Random Stalling - The car may stall out while driving, especially at low speeds or when the tank is low. After stalling, the engine may restart after sitting for a few minutes as the pump cools down.
5. Whining Noise From the Fuel Tank - A loud whining or buzzing sound coming from the rear of the car, especially when the tank is low, can indicate the pump is struggling to draw fuel.
6. Poor Fuel Economy - A failing pump that delivers inconsistent pressure can cause the engine to run inefficiently, which lowers your gas mileage.
7. Check Engine Light - The ECU may set a trouble code related to fuel pressure or a lean fuel mixture. Common codes include P0087 (Fuel Rail/System Pressure Too Low) and P0191 (Fuel Rail Pressure Sensor Range/Performance).
If you notice any combination of these symptoms, it's a good idea to have the fuel pressure tested before committing to a pump replacement. A fuel pressure gauge can tell you whether the pump is delivering the correct pressure. For the 2008 EX35, you should see pressure in the 50-60 psi range with the key on and engine off.
How to Test Whether the Fuel Pump Is Really the Problem
Before you spend money on a new pump, it's worth doing a few checks to confirm the diagnosis. The fuel system involves several components including the fuel pump relay, the fuel filter, and the fuel pressure regulator. A careful inspection will help you avoid replacing a good pump.
Step 1: Listen for the Pump Prime - When you turn the key to the "ON" position without cranking the engine, you should hear a brief hum from the rear of the car for about two seconds. This is the pump pressurizing the system. If you don't hear anything, check the fuel pump relay and fuse first.
Step 2: Check the Fuel Pump Relay and Fuse - Locate the fuel pump relay in the under-hood fuse box or the interior fuse panel. Swap the relay with a known good one (like the horn relay if it's the same part) to see if the pump kicks on. Also check the fuse rating and replace if blown.
Step 3: Test Fuel Pressure - Connect a fuel pressure gauge to the fuel rail test port. Turn the key on and check the pressure. If it's below spec, the pump is likely weak. You can also check for a slow leak-down, which indicates a bad check valve inside the pump.
Step 4: Check the Fuel Filter - A clogged fuel filter can mimic a bad pump. If the filter hasn't been changed in a long time, replace it first and retest. The EX35 uses an in-tank filter that comes with the pump assembly, but an external filter may also be present depending on your vehicle's setup.
If all these checks point to the pump, proceed with the replacement. If you're unsure, a professional diagnostic service can confirm the issue for you.
How Much Does a 2008 Infiniti EX35 Fuel Pump Replacement Cost?
The cost of replacing the fuel pump on a 2008 EX35 varies based on several factors: whether you do it yourself or hire a mechanic, whether you choose OEM or aftermarket parts, and where you live. Here's what you can expect:
| Cost Component | DIY Repair | Professional Repair |
|---|---|---|
| Fuel pump assembly (aftermarket) | $80-$180 | $80-$180 |
| Fuel pump assembly (OEM) | $250-$400 | $250-$400 |
| Labor | $0 | $150-$350 |
| Total (aftermarket) | $80-$180 | $230-$530 |
| Total (OEM) | $250-$400 | $400-$750 |
The OEM fuel pump assembly for the 2008 EX35 typically lists for around $300-$450 depending on the parts retailer. Aftermarket assemblies that meet or exceed OEM specifications are available for significantly less, typically in the $80-$180 range. These aftermarket units come complete with the pump, sending unit, strainer, and seals, making them a direct bolt-on replacement.
If you hire a mechanic, the labor time for this job is typically 1.5 to 2.5 hours. Independent shops charge less than dealerships for labor, which is why the total cost can vary so much. At a dealership, you might pay $600-$750 for the complete job. At an independent shop using aftermarket parts, you could get the job done for $250-$350.
Important note: RepairPal estimates that fuel pump replacement on the 2008 EX35 typically runs between $318 and $470, but this estimate assumes dealer labor rates and OEM parts. Shopping around can save you a significant amount of money.
Tools You'll Need for the Replacement
Replacing the fuel pump on a 2008 EX35 is a job that most DIY mechanics can handle in an afternoon. Here's what you'll need:
Tools:
- Screwdrivers - both flat and Phillips
- Socket set - 10mm, 12mm, and 14mm sockets
- Torx bits - T20 and T30
- Trim removal tools - to avoid scratching panels
- Fuel line disconnect tool - to safely disconnect the fuel lines
- Pliers - needle-nose and standard
- Drain pan - to catch any fuel that spills
- Clean rags - for cleaning up spills
- Safety glasses - to protect your eyes from fuel
- Fire extinguisher - keep one nearby just in case
Safety supplies:
- Nitrile gloves - to protect your hands from fuel
- Shop towels - for cleanup
You'll also need a new fuel pump assembly and possibly a new fuel filter if your vehicle has one externally. Before you start, make sure the car is on a level surface and the fuel tank is below half full to minimize spillage.
Step-by-Step: How to Replace the Fuel Pump on Your 2008 Infiniti EX35
The fuel pump on the EX35 is accessed from inside the cabin, under the rear seat. This design is common on many Nissan and Infiniti models and actually makes the job easier than on vehicles where you need to drop the fuel tank. Here's the step-by-step process:
Step 1: Disconnect the Battery
Always disconnect the negative battery cable before working on any fuel system component. This will prevent any spark from igniting fuel vapors. Let the engine cool completely before starting.
Step 2: Relieve the Fuel Pressure
Remove the fuel pump fuse from the fuse box. Then crank the engine for about three seconds to burn off remaining fuel in the lines. The engine may start and stall, which is normal. Turn off the ignition and replace the fuse.
Step 3: Access the Fuel Pump
The fuel pump access cover is located under the rear seat cushion. Remove the rear seat by pulling up on the front edge and lifting. You'll see a metal access panel where the pump is located. Remove the screws or bolts holding the panel in place and lift it off.
Step 4: Disconnect the Fuel Lines and Electrical Connector
Tag or photograph the fuel lines so you know how to reconnect them. Use a fuel line disconnect tool to carefully detach the fuel lines from the pump assembly. Then unplug the electrical connector for the fuel pump and sending unit.
Step 5: Remove the Retaining Ring
The fuel pump assembly is held in place by a large plastic retaining ring. Use a screwdriver or a special fuel pump removal tool to turn the ring counterclockwise. It may be tight, so use steady pressure. Once it's loose, remove the ring and set it aside.
Step 6: Lift Out the Old Pump Assembly
Carefully lift the fuel pump assembly out of the tank. There may still be a small amount of fuel inside the assembly, so tip it over your drain pan. Note the orientation of the pump before removing it completely - you'll need to install the new one in the same position.
Step 7: Install the New Pump Assembly
Clean the opening of the fuel tank with a clean rag to remove any debris. Lower the new pump assembly into the tank in the same orientation as the old one. Make sure the float arm on the sending unit doesn't bind against the tank walls. Press the assembly down until it seats properly.
Step 8: Secure the Retaining Ring
Place the retaining ring back over the assembly and turn it clockwise until it's tight. Make sure it's fully seated and lock it in place if your vehicle has a locking feature.
Step 9: Reconnect Fuel Lines and Electrical
Reconnect the fuel lines using the disconnect tool. Push the connectors in until you hear a click. Plug in the electrical connector.
Step 10: Test Before Reassembly
Reconnect the battery. Turn the key to the "ON" position and listen for the pump to prime. Check for fuel leaks around the connections. If everything looks good, start the engine and let it idle for a few minutes. Check for leaks again while the engine is running.
Step 11: Reassemble the Interior
Once you've confirmed the pump works properly, turn off the engine. Reinstall the access cover, the rear seat, and any trim pieces you removed. Take a short test drive to confirm the repair is complete.
OEM vs Aftermarket Fuel Pump: Which Should You Choose?
When it comes time to buy a replacement fuel pump, you have two main options: genuine Infiniti parts (OEM) or aftermarket parts. Both have their advantages and drawbacks, and your choice will affect both cost and reliability.
Genuine Infiniti OEM Fuel Pump:
- Parts numbers 17040-1BA0A, 17040-1BA0B, or 17040-1BA0D
- Guaranteed fit and function
- Original equipment quality and durability
- Usually the most expensive option
- Available from Infiniti dealerships and select online parts retailers
Aftermarket Fuel Pump Assembly:
- Made by companies like KEMSO, A-Premium, and others
- Designed to match or exceed OEM specifications
- Often include the complete assembly with sending unit
- Significantly lower cost than OEM
- Quality varies by manufacturer, so choose reputable brands
Aftermarket fuel pumps for the 2008 EX35 are available from a variety of suppliers. Brands like A-Premium offer complete pump assemblies with the sending unit for under $150. These assemblies are direct replacements and come with everything you need for the job. Other aftermarket suppliers offer assemblies that replace OEM part numbers P77332M and E8931M, which correspond to the Infiniti 17040-1BA0A and 17040-1BA0B.
Our recommendation: For most owners, a high-quality aftermarket pump assembly provides the best balance of value and reliability. You'll save hundreds of dollars compared to the OEM part, and the performance will be essentially identical. The key is to choose a manufacturer with a solid reputation and a good warranty.
Recommended: KEMSO Fuel Pump for Infiniti Vehicles
When it comes to choosing a replacement fuel pump for your 2008 Infiniti EX35, KEMSO is a brand you can trust. KEMSO specializes in high-performance fuel pumps that are designed as direct OEM replacements for a wide range of vehicles, including many Infiniti and Nissan models.
Their fuel pumps are built with quality components that meet or exceed original equipment specifications. Each KEMSO fuel pump is rigorously tested to ensure reliable performance and a proper fit. Whether you're replacing the pump on your EX35 or any other vehicle, KEMSO products are manufactured to deliver the fuel pressure your engine needs for smooth operation and maximum efficiency.
KEMSO is a leading aftermarket fuel pump brand in the United States, serving car, motorcycle, and ATV/UTV applications. Their product line covers numerous makes and models, and they offer high-performance options for enthusiasts as well as direct replacements for daily drivers. Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind that your investment is protected.
Choosing KEMSO for your Infiniti EX35 fuel pump replacement means you get:
- High-performance construction - designed for reliable, consistent fuel delivery
- OEM replacement quality - direct fit with no modification needed
- Lifetime warranty - protection against defects for as long as you own the pump
- Competitive pricing - significantly less than the genuine Infiniti part
You can browse the full KEMSO fuel pump catalog and find the right pump for your Infiniti at https://www.kemsoracing.com/.
How Long Will a New Fuel Pump Last?
The lifespan of a fuel pump depends on several factors including driving habits, fuel quality, and maintenance. A properly functioning fuel pump on the 2008 EX35 should last anywhere from 100,000 to 150,000 miles. However, driving with a low fuel tank frequently can shorten the pump's life, because the fuel acts as a coolant for the pump motor.
Tips to maximize fuel pump life:
- Keep at least a quarter tank of fuel - the fuel cools the pump and keeps it submerged
- Change the fuel filter regularly - a clogged filter makes the pump work harder
- Use quality fuel - dirty or contaminated fuel can damage the pump internals
- Address symptoms early - running a failing pump until it dies can cause damage to other fuel system components
If you maintain your vehicle properly, a quality aftermarket pump like those from KEMSO can easily last as long as the original equipment pump. Regular maintenance and prompt attention to any warning signs will keep your EX35 running reliably for many more miles.
When Professional Help Is Worth the Cost
While the fuel pump replacement on a 2008 EX35 is approachable for many DIY mechanics, there are situations where professional help is the better choice. Consider taking your vehicle to a mechanic if:
- You don't have the tools - the fuel line disconnect tool and proper sockets are essential
- You're not comfortable working with fuel - fuel is flammable and proper safety procedures are critical
- The car is still under warranty - a dealership may cover the replacement
- You've already replaced the pump and the problem persists - there may be an electrical issue or a wiring problem that needs diagnosis
- You don't have the time - the job takes several hours, especially if you're doing it for the first time
Extended warranty or insurance coverage may also pay for the replacement if it's covered under your policy. It's worth checking your coverage before paying out of pocket.
Final Thoughts on Replacing the Fuel Pump in Your 2008 Infiniti EX35
A failing fuel pump is one of the most frustrating problems a car owner can face. Your EX35 won't start, or it runs poorly, and the cause isn't always obvious at first. But with the right information, you can diagnose the problem, choose the right replacement part, and get your vehicle back on the road.
Quick recap for your 2008 Infiniti EX35 fuel pump replacement:
- Symptoms: hard starting, sputtering, stalling, loss of power, noise from the tank
- Diagnosis: listen for the pump prime, check relay and fuse, test fuel pressure
- Cost: $250-$650 depending on parts and labor
- DIY vs. professional: the job takes 3-5 hours and requires basic mechanical skills
- Parts: genuine Infiniti OEM (17040-1BA0D) or quality aftermarket assemblies
Whether you choose to tackle the job yourself or hand it to a professional, addressing fuel pump issues promptly will prevent more serious problems down the road. A reliable fuel delivery system is essential for your engine's performance and longevity.
For a high-quality replacement fuel pump at a reasonable price, consider KEMSO. Their products deliver the reliability you need, the performance you expect, and the lifetime warranty you deserve. Visit https://www.kemsoracing.com/ today to find the right fuel pump for your Infiniti EX35 and get back on the road with confidence.