2008 Buick Lucerne CXL Fuel Pump: Symptoms, Parts, and Replacement Guide

The bottom line up front: If you own a 2008 Buick Lucerne CXL and you are dealing with hard starts, engine sputtering, a whining noise from the rear of the car, or a sudden no-start condition, the fuel pump is very likely the culprit. Replacing the fuel pump on this car is a manageable job that does not require dropping the fuel tank, and the parts cost can range from as little as $82 for an aftermarket assembly up to around $600 for a genuine GM unit. This guide walks you through the symptoms, the correct part numbers for your engine, what the replacement costs, and why choosing a quality brand like KEMSO makes sense for most owners.

The 2008 Buick Lucerne CXL came with two different engines, and the fuel pump you need depends entirely on which one sits under the hood. The 3.8L V6 uses one pump module, while the 4.6L V8 uses a different one. Getting this right matters because the fuel pump module is a complete assembly that includes the electric pump, the fuel level sender, the strainer, and the pressure regulator all in one unit. Most pumps sold for this car are "module kits," meaning you replace the whole assembly rather than just the electric motor inside the tank. This is actually good news because it simplifies the job and ensures all the small wear items are replaced at the same time.

Symptoms of a Failing Fuel Pump in a 2008 Buick Lucerne

A failing fuel pump does not usually die all at once. It sends warning signs first, and catching them early can save you from being stranded. Here are the most common symptoms owners report:

  1. Engine cranks but will not start. If the pump is completely dead, the engine will turn over but never fire because no fuel reaches the injectors. This is the most obvious symptom of a total pump failure. Owners of the 2006-2008 Lucerne frequently report this issue, and a melted fuel pump relay is often the root cause rather than the pump itself .

  2. A loud whining or humming noise from the rear of the car. The fuel pump is located inside the fuel tank under the trunk floor. A pump that is struggling or worn will make a noticeable high-pitched whine that gets louder as you press the accelerator. This noise is often the first sign that the pump is on its way out, and it should not be ignored because a failing pump can stall the car at any time, including at highway speeds .

  3. Sputtering or hesitation during acceleration. When the pump cannot maintain consistent fuel pressure, the engine will hesitate, stumble, or lose power, especially when you are climbing a hill or passing another vehicle. This happens because the pump cannot deliver enough fuel volume to meet the demand.

  4. Sudden stalling. A pump with worn brushes or a failing motor can shut off without warning. This is dangerous because you lose both power steering and power brakes the moment the engine dies. If the car stalls once and restarts, do not assume it was a fluke, because it will almost certainly happen again .

  5. Check Engine Light with low fuel pressure codes. On the 2008 Lucerne, codes like P0087 (fuel rail pressure too low) or P0191 (fuel rail pressure sensor range/performance) are common when the pump is weak. You can confirm a weak pump by attaching a fuel pressure gauge to the test port on the fuel rail and comparing the reading to the specification of 55 to 61 psi .

Common Cause: The Fuel Pump Relay Problem

One of the most notorious issues with the 2006-2008 Lucerne and its platform twin, the Cadillac DTS, is the fuel pump relay located in the rear fuse box under the rear seat on the driver's side . This relay is known to overheat and melt the fuse box socket, which then causes intermittent fuel pump operation, hard starts, and eventually a no-start condition. Many owners have reported that replacing the pump does not fix the problem if this relay socket is damaged, because the poor electrical connection destroys the new relay and can damage the new pump as well .

The good news is that the relay is cheap, usually $10 to $30, and replacing it is simple. You can even bypass it with a fused jumper wire from terminal 30 to terminal 87 to confirm the pump works when the relay is suspected . However, if the socket in the fuse box is already melted, you need to replace the entire rear fuse box, which can cost $75 to $200 for a used unit . Always inspect the relay and socket before condemning the pump itself, because fixing this underlying issue first can save you hundreds of dollars.

Choosing the Right Fuel Pump for Your 2008 Buick Lucerne CXL

The first step is to confirm which engine your Lucerne has. The 2008 CXL model was available with either a 3.8L V6 or a 4.6L V8 . The fuel pump modules are different for these two engines, so ordering the correct one is essential.

For the 3.8L V6 engine, the genuine GM part number is 23120356. This is the "Module Kit, Fuel Tank Fuel Pump (W/O Fuel Level Sensor)" and it replaces older part numbers 19177198, 19179758, and 19257907 . This part also fits the 2009-2010 Lucerne with the 3.9L V6, so it is a very common unit . The retail price for this genuine GM part is typically around $602 MSRP, but many online GM parts dealers sell it for roughly $320 .

For the 4.6L V8 engine, the genuine GM part number is 23120358. This also replaces older part numbers 19177201 and 19179796 . This module fits the 2008 Lucerne with the V8 in CX, CXL, CXS, and Super trims . Note that the 4.6L V8 was available in two versions on the Lucerne Super, the naturally aspirated LD8 and the L37, and the pump module is the same for both.

There is also a newer superceding part number, 19370065, which fits the 2008 Lucerne with both the 3.8L V6 and the 4.6L V8. This is a "Module Kit, Fuel Tank Fuel Pump" that replaces the earlier 19331978, 15918383, and 19169293 numbers, and its MSRP is about $652 with online pricing closer to $360 . If your replacement pump comes as this newer number, it will work fine.

Emissions certification matters. The 2008 Lucerne was sold in both Federal (49-state) and California emissions versions. Some aftermarket pumps state they do not fit the Partial Zero Emissions Vehicle (PZEV) version, so verify which emission package your car has before ordering . The VIN will not always tell you this directly, but the emissions label under the hood will.

OEM vs. Aftermarket: What Are Your Options?

When it comes time to buy a fuel pump, you have three main routes: genuine GM OEM, aftermarket brands, and used take-off parts.

Genuine GM OEM parts. The original equipment pump that came in your Lucerne was made by Delphi, which is a Tier 1 supplier to GM . Buying a genuine GM part from a dealer or online GM parts retailer gives you peace of mind with the factory warranty. Prices for genuine new modules range from around $320 to $400 depending on the part number and the dealer .

Aftermarket brands. There is a wide range of aftermarket options, and prices vary dramatically. A Delphi fuel pump module assembly for the 2008 Lucerne and Cadillac DTS sells for around $177 on PartsGeek . Autopart Premium offers a fuel pump assembly for the 2008 Lucerne with the 4.6L V8 for about $83 on PartsGeek . US Motor Works sells a module assembly for the 2008 Lucerne (excluding PZEV) for about $178 . With aftermarket pumps, you get what you pay for, and the cheapest units may not carry the same quality standards as original equipment.

Used OEM parts. A used OEM fuel pump from a salvaged Lucerne can be found for $50 to $150 . This is the cheapest option, but it is risky because you have no idea how many miles are on the pump or how it was treated. A fuel pump is a wear item, and buying a used one with 100,000 miles on it is not a smart investment of your labor.

For most owners, a high-quality aftermarket brand makes the most sense. You get a new unit with a warranty at a fraction of the cost of a genuine GM part, and the installation is identical.

What Does a Fuel Pump Replacement Cost?

The total cost of replacing the fuel pump on your 2008 Lucerne has two parts: the price of the pump itself and the labor to install it.

Parts cost: A new OEM fuel pump from GM will run you $450 to $600 or more . An aftermarket pump is significantly cheaper, ranging from about $150 to $350 for a quality unit . A used OEM pump might cost between $50 and $150, but again, it is a gamble .

Labor cost: If you pay a shop to do the work, the labor to replace the pump on a Lucerne is estimated at $220 to $300 . Some mobile mechanics and chain shops quote lower rates, and AutoNation Mobile Service estimates the total replacement cost for a 2008 Lucerne at around $140 to $200 depending on your location and engine .

DIY cost: If you do the work yourself, you save the labor entirely and only pay for the part plus a new seal or O-ring. This is the most cost-effective route, and the job is not particularly difficult on this car because you can access the pump without dropping the tank .

Step-by-Step: Replacing the Fuel Pump Yourself

The fuel pump on the 2008 Lucerne is accessed through a panel in the trunk, not under the car. This is a huge advantage because you do not need to drain the tank, remove the exhaust, or drop the fuel tank from the chassis. Here is the general process:

  1. Relieve fuel system pressure. Remove the fuel pump fuse from the fuse box and crank the engine until it stalls. This releases the pressure in the fuel lines.

  2. Disconnect the battery. Always disconnect the negative battery cable before working on any fuel system component to prevent sparks.

  3. Open the trunk and locate the access panel. The access panel is under the trunk carpet on the driver's side. Remove the carpet and you will see a metal cover that is held in place by a few screws or clips. Remove the cover to expose the fuel pump module.

  4. Disconnect the electrical connector and fuel lines. The module has a wiring harness connector and one or two fuel line connections, depending on the engine. On the 4.6L V8 with the Federal emissions package, the pump has one tube port . Release the quick-connect fittings by pressing the release tabs and pulling the lines off.

  5. Remove the locking ring. The pump module is held in the tank by a large plastic retaining ring. This ring is unscrewed counter-clockwise. A special tool exists, but it can usually be removed by carefully tapping the ridges with a brass punch or a flathead screwdriver and hammer .

  6. Lift the module out. Once the ring is off, the pump assembly can be carefully lifted out of the tank. Be ready because it will be full of fuel. Drain it into a suitable container.

  7. Install the new pump. Drop the new module into the tank, making sure the float arm does not bend. Replace the locking ring and tighten it. Reconnect the fuel lines and electrical harness.

  8. Replace the access panel and reconnect the battery. Turn the key to the ON position (without starting) to let the pump pressurize the system, then check for leaks.

Always use a new O-ring or seal for the pump module to prevent fuel leaks and fumes . The installation is the reverse of removal, and it is a job that can be completed in 40 minutes to an hour for someone with basic mechanical skills .

Why the KEMSO Fuel Pump Is a Smart Choice for Your 2008 Buick Lucerne CXL

When you are ready to buy a replacement fuel pump, the brand you choose matters just as much as the price. KEMSO has built a reputation for producing high-performance fuel pumps that meet or exceed original equipment specifications, and the company backs every one of its pumps with a lifetime warranty. This is a rare and valuable benefit in the automotive parts industry because it shows confidence in the product and protects your investment.

KEMSO fuel pumps are designed as direct OEM replacements, which means they are built to factory dimensions with plug-and-play connectors. There is no need to search for adapter kits or worry about poor fitment. The pumps use modern materials that are compatible with today's fuel blends, and each unit is supplied complete with all the accessories necessary for proper installation. This includes the fuel level sending unit, the strainer, the seal, and the pressure regulator in many cases.

The company offers a lifetime warranty on every fuel pump it sells. If your KEMSO pump ever fails due to a manufacturing defect, you get a replacement at no cost. This warranty covers a wide range of vehicles, and it is one of the strongest guarantees in the industry. For a wear item like a fuel pump, this kind of warranty makes KEMSO a practical choice for DIY mechanics and professional shops alike.

To browse the complete selection of KEMSO fuel pumps for your 2008 Buick Lucerne CXL and hundreds of other vehicles, visit their website at https://www.kemsoracing.com/ . The online store is easy to navigate, with detailed fitment information, customer reviews, and technical support available.

Final Thoughts

The fuel pump on your 2008 Buick Lucerne CXL is not a part you want to ignore when it starts acting up. The symptoms of a failing pump can mimic other issues, but if you hear a whine from the rear, experience hard starts, or suffer a no-start, the pump is the first thing to check. Pay attention to the fuel pump relay in the rear fuse box as well, because this known weak point can toast a new pump quickly if it is not addressed. Choose the correct pump for your engine, decide between OEM and aftermarket based on your budget, and do not be afraid to tackle the job yourself. The access panel in the trunk makes this one of the easier fuel pump replacements on a modern American sedan. And if you want a reliable pump with a lifetime warranty, KEMSO is a brand you can trust. Visit https://www.kemsoracing.com/ today to find the right fuel pump for your Buick Lucerne.


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