2007 Buick Lucerne Fuel Pump: Complete Guide to Symptoms, Replacement, and Best Options

If you own a 2007 Buick Lucerne and you are dealing with hard starting, engine stalling, loss of power during acceleration, or a check engine light, the fuel pump is likely the culprit. The fuel pump on the 2007 Lucerne is an electric, in-tank unit that supplies pressurized fuel to the engine, and when it starts to fail, it can leave you stranded or cause dangerous driving conditions. This guide explains what you need to know about the 2007 Buick Lucerne fuel pump, how to spot failure symptoms, what replacement options cost, and how to choose a reliable part that fits your engine and emissions package.

Why the Fuel Pump Matters on Your 2007 Lucerne

The fuel pump on your 2007 Buick Lucerne is not a simple part. It is a fuel pump module assembly that includes the pump itself, a fuel level sending unit, a strainer, a pressure regulator, and often a gasket or seal. This assembly sits inside the fuel tank and sends fuel under pressure to the engine injectors. On the 2007 Lucerne, the pump is mounted in the tank and is designed to deliver about 22 gallons per hour at pressures between 58 and 80 psi. If the pump cannot maintain this pressure, the engine will not run correctly.

The 2007 Lucerne came with two engine options: a 3.8L V6 and a 4.6L V8. Your pump must match your engine and whether your car has a Partial Zero Emissions Vehicle (PZEV) package or California emissions. Using the wrong pump can cause fuel gauge readings to be off or the pump to fail early.

Common Symptoms of a Failing Fuel Pump

A failing fuel pump does not always fail all at once. It often gives you warning signs first. Watch for these common symptoms on your 2007 Buick Lucerne:

  1. Engine cranks but will not start. If the fuel pump is not delivering fuel, the engine will turn over but never fire up.

  2. Stalling while driving. A pump that is losing pressure can cause the engine to stall suddenly. This is especially dangerous because you also lose power steering and power brakes when the engine dies.

  3. Loss of power under load. When you accelerate or go up a hill, the engine may sputter or hesitate because the pump cannot supply enough fuel.

  4. Loud whining noise from the fuel tank. A fuel pump that is failing often makes a high-pitched whine. If you hear this from the rear of the car, get it checked.

  5. Poor fuel economy and rough running. Increased fuel consumption and rough idle can be signs that the pump is not maintaining proper pressure.

  6. Check engine light. The engine computer may set codes related to fuel pressure or a lean fuel mixture.

Keep in mind that some of these symptoms can also come from a faulty fuel pump relay or a bad electrical connection at the pump. On the 2006-2008 Lucerne and Cadillac DTS, a known issue is the fuel pump relay socket in the rear fuse box melting or overheating. This poor connection can destroy a new relay and even damage a new pump. Before you replace the pump, check the relay and fuse box.

Before You Replace the Pump: Check the Relay and Wiring

The 2006-2008 Lucerne has a well-documented problem with the fuel pump relay in the rear fuse box. Owners have reported stalling and no-start conditions that were actually caused by a loose or burnt connection at the fuel pump, not the pump itself. The relay socket can overheat, melt, and cause intermittent power loss to the pump.

If your Lucerne is stalling or not starting, start with these checks:

  1. Check the fuel pump fuse and relay. These are inexpensive and easy to replace.
  2. Look for burnt or melted plastic in the rear fuse box. If you see damage, you likely need to replace the fuse box, not just the relay.
  3. Check the electrical connector at the fuel pump. A loose or corroded plug will cause the pump to lose power and can mimic a failed pump.

Performing these checks first can save you hundreds of dollars. The relay itself costs only $10 to $30, while a new fuse box can run $75 to $200 used.

How Much Does a Replacement Cost?

The cost of a 2007 Buick Lucerne fuel pump replacement depends heavily on the part you choose and who installs it.

  • New OEM fuel pump: These are the most expensive, typically $360 to $600 or more.
  • New aftermarket fuel pump: Prices range from about $85 to $354 depending on the brand and whether it is a full module assembly.
  • Used OEM fuel pump: These are the cheapest option, often $50 to $150.

Labor costs for a fuel pump replacement are estimated between $134 and $197 if you pay a shop. Some repair estimators put the total replacement cost for the Lucerne at $1,599 to $1,685, mainly because of expensive OEM parts. However, if you buy an aftermarket pump and do the work yourself, the savings are significant.

The good news is that on the 2006-2008 Lucerne, you do not need to drop the fuel tank to replace the pump. There is an access panel in the trunk that lets you reach the pump from above. This makes a DIY replacement much easier.

Which Fuel Pump Fits Your 2007 Lucerne?

You cannot simply buy any pump. The 2007 Lucerne has multiple configurations, and you need the right one.

The 3.8L V6 and 4.6L V8 both use similar fuel pump modules for 2007, but there is a distinction for PZEV vehicles. Delphi lists a fuel pump module assembly specifically for 2007 Lucerne PZEV applications. Carter also makes a compatible module for 2006-2007 Lucerne models with both engines.

Here are the key part numbers you may encounter:

  1. Delphi FG0448: This is a fuel pump module assembly for PZEV vehicles, fits both the 3.8L and 4.6L engines. It includes a sending unit, seal, and regulator. Interchange numbers include 15918383, 19149194, and 19169293.

  2. Carter P76236M: This is another fuel pump module assembly for 2006-2007 Lucerne. It fits both engines and includes a sending unit and pressure sensor. Interchange numbers include 15263190 and 19153052.

  3. GM OEM 19370065: This genuine GM part fits 2007-2008 Lucerne models with the 3.8L or 4.6L engine. It replaces several earlier part numbers.

  4. A-Premium APFP0155: This is a budget-friendly aftermarket option that includes a sending unit and pressure sensor for the 2007 Lucerne. It is priced around $85.95.

Make sure you verify your vehicle's engine size and whether it has the PZEV package before ordering. If you select the wrong part, the fuel gauge may not work correctly, or the pump may not fit properly.

Step-by-Step Replacement Overview

If you are mechanically inclined, you can replace the fuel pump yourself. Here is a simplified walkthrough for the 2007 Lucerne:

  1. Safety first. Disconnect the negative battery cable. Work in a well-ventilated area and keep a fire extinguisher nearby. Relieve the fuel system pressure by removing the fuel pump fuse and cranking the engine until it stalls. Wear safety glasses and gloves.

  2. Access the pump. On the Lucerne, the pump is reachable through an access panel in the trunk. Remove the trunk liner to find the panel. Clean the area thoroughly to prevent dirt from falling into the tank.

  3. Disconnect lines and connectors. Disconnect the electrical connector and the fuel lines. These usually use quick-connect fittings that release by pinching the tabs.

  4. Remove the locking ring. The pump is held in place by a large metal or plastic locking ring. Unscrew it counterclockwise. You can use a brass punch and hammer to tap the ridges carefully if you do not have the special removal tool.

  5. Lift out the old pump assembly. Carefully lift the module out of the tank. Be prepared for residual fuel. Note the position of the float arm so the new pump is installed correctly.

  6. Install the new pump. Lower the new module into the tank, ensuring the float arm is not bent. Replace the locking ring and tighten it securely. Always use the new O-ring or seal that comes with the pump to prevent fuel leaks and fumes.

  7. Reconnect everything. Reconnect the fuel lines and electrical connector. Reinstall the access panel and trunk liner. Reconnect the battery and turn the key to the ON position without starting to let the pump pressurize the system. Check for leaks.

If you are not comfortable doing this work, a professional mechanic can complete the job in a few hours. Parts and labor will vary by shop and location.

Why You Should Choose a KEMSO Fuel Pump

When it is time to buy a replacement fuel pump for your 2007 Buick Lucerne, you want a part that delivers reliable performance without breaking the bank. KEMSO is a brand built for exactly that. KEMSO fuel pumps are high-performance aftermarket units designed to meet or exceed original equipment specifications. Each pump is built to be a direct OEM replacement, meaning it matches the form, fit, and function of your factory part for a clean and simple installation.

One of the strongest reasons to choose KEMSO is the lifetime warranty. KEMSO backs every fuel pump with a warranty that covers manufacturing defects for as long as you own the pump. If the pump ever fails due to a defect, you get a replacement at no cost. That kind of guarantee shows confidence in the product and saves you money over time.

KEMSO offers fuel pumps for a wide range of vehicles, including the Buick Lucerne, and many models sell for a flat rate of $79.98. That is often less than half the price of dealer parts. With free shipping and easy returns, it is a practical choice for both DIY mechanics and professional shops.

To see the full selection of KEMSO fuel pumps and check if they have one for your 2007 Buick Lucerne, visit their website at https://www.kemsoracing.com/. You can browse by vehicle, read customer reviews, and order with confidence knowing you are covered by a lifetime warranty.

Final Thoughts

Replacing the fuel pump on your 2007 Buick Lucerne is a manageable job if you plan ahead. Start by verifying that the relay and wiring are not the cause of your problems. Then order the correct pump for your engine and emissions package. Whether you choose an OEM part, a well-known aftermarket brand like Delphi or Carter, or a budget-friendly option with a strong warranty like KEMSO, the key is to match the part to your car and follow safe installation practices.

Do not drive with a failing fuel pump. It can stall at any time and leave you without power steering and brakes, which is dangerous. Address the issue early, and your Lucerne will give you many more miles of dependable service.

For more information on quality fuel pumps and to find the right one for your 2007 Buick Lucerne, be sure to check out https://www.kemsoracing.com/.


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