A Guide to the Electric Fuel Pump for the 2012-2020 Kia Optima
Understand the signs of a failing electric fuel pump in your Optima and learn how to choose the best aftermarket replacement.
- A failing electric fuel pump causes stalling, hesitation, and starting problems.
- For 2016-2020 models, check with a Kia dealer for an extended warranty on the low-pressure fuel pump before paying for repairs.
- Choose a quality aftermarket brand like Delphi for OEM-level reliability or US Motor Works/GMB/AutoBest for a good balance of price and performance.
- Always replace the complete fuel pump module assembly, not just the motor, to ensure all components are new.
Is Your Kia Optima's Fuel Pump Failing?
A failing electric fuel pump can cause significant and frustrating problems with your car. The symptoms often start small but can lead to your car not starting at all. If you notice any of these issues, it's time to inspect the fuel system.
Distinguishing Between Fuel Pumps
Your Kia Optima has two fuel pumps: a low-pressure electric pump in the gas tank and, on GDI models, a high-pressure mechanical pump on the engine. This guide focuses on the in-tank electric fuel pump. The code P0087 often points to the high-pressure pump, but a failing low-pressure pump can also cause it by starving the high-pressure one for fuel.
Common Symptoms of a Bad Electric Fuel Pump
- Difficulty Starting: The engine cranks for a long time before it finally starts because it isn't getting enough fuel right away.
- Engine Stalling: The engine may stall unexpectedly, especially at idle or shortly after starting, due to an inconsistent fuel supply.
- Loss of Power: You might feel a hesitation or sluggishness when you accelerate, as the pump can't keep up with the engine's demand for fuel.
- Whining Noise: A noticeable humming or whining sound coming from the rear seat area (above the fuel tank) is a classic sign of a struggling fuel pump motor.
- Reduced Fuel Economy: If the pump is inefficient, your car may start using more gas than usual.
Choosing the Right Aftermarket Fuel Pump
When replacing the fuel pump, you have a choice between OEM and several aftermarket brands. For a critical part like this, quality matters. A cheap, unreliable pump can fail quickly, leaving you stranded again.
Here’s a breakdown of available brands:
- Top Tier (OEM Equivalent): Delphi is a well-respected global OEM manufacturer. Their fuel pumps are built to high standards, often featuring designs that lower the electrical load on your car and have low failure rates. Choosing Delphi is the closest you can get to original factory quality.
- Mid-Grade (Reliable Alternatives): Brands like GMB, US Motor Works, and AutoBest offer a good balance of quality and value. US Motor Works has a solid reputation for durability and cost-effectiveness, with some users reporting it outperforms higher-priced options. GMB is also considered a reliable aftermarket choice. AutoBest is a specialist in fuel pumps and is certified for its quality manufacturing processes.
- Budget-Friendly: While the lowest-priced options are tempting, they often come with a higher risk of premature failure. For a part that requires significant labor to access, it's often worth spending more on a reputable brand to avoid doing the job twice.
Pro Tip: Replace the Assembly
It is highly recommended to replace the entire fuel pump module assembly, not just the pump motor itself. The assembly includes the pump, sending unit (for the gas gauge), fuel strainer, and float. This ensures all related components are new and prevents issues with incorrect fuel level readings or clogs from an old strainer.
Known Issues, Recalls, and Warranty Extensions
While there are no direct recalls for the in-tank electric fuel pump itself, several related issues are important to know:
- Warranty Extension (2016-2020 Models): Kia extended the warranty for the low-pressure fuel pump on 2016-2020 Optima models to 15 years or 150,000 miles. This was to address failures that could cause power loss, stalling, or a no-start condition, sometimes related to a cracked fuel pump filter housing (DTC P1233). If your vehicle falls in this range, contact a Kia dealer to check for coverage.
- High-Pressure Fuel Pipe Recall (2011-2017 Models): Some Optimas that had engine replacements were recalled because the high-pressure fuel pipe may have been damaged or improperly installed, leading to a fuel leak and fire risk.
- Low-Pressure Fuel Line Recall (2013-2014 Models): A recall was issued for a low-pressure fuel line in the engine bay that could degrade and leak fuel.
Replacement Cost
The cost to replace your Kia Optima's electric fuel pump can vary. The parts themselves have a wide price range, and labor costs depend on shop rates.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Fuel Pump Assembly | $48 - $384 |
| Shop Labor | $140 - $250 |
| Total Estimated Cost | $188 - $634 |
Frequently Asked Questions
Can I drive my Optima with a bad fuel pump?
It is not recommended. While the car may still run, a failing pump can cause the engine to stall at any time, which is a serious safety risk. Complete failure will leave you stranded.
Is this a DIY job? 🎬 Watch this step-by-step tutorial on replacing the fuel pump assembly.
Replacing the fuel pump is possible for an experienced DIY mechanic. It involves removing the rear seat cushion to access the pump module on top of the gas tank. However, it requires handling gasoline safely and can be tricky due to the tight space. If you are not comfortable with this, it's best to leave it to a professional.
Why did my fuel pump fail?
Common causes include frequently driving with a very low fuel level, which causes the pump to overheat, or a clogged fuel filter that makes the pump work too hard. Contaminated fuel can also damage the pump's internal components.
What is the difference between the low-pressure and high-pressure fuel pump?
The low-pressure electric pump (the subject of this guide) is in the fuel tank and sends fuel to the engine at around 65 psi. The high-pressure fuel pump (HPFP) is mounted on the engine and driven by the camshaft. It boosts fuel pressure to over 1,900 psi for the direct injectors. A failure in either pump can cause similar symptoms, but the diagnostic trouble code P0087 most often points to an issue with the high-pressure system.
Helpful Videos
Technical Specifications
OEM Part Numbers: 31110-3Q650 31110-3Q550 31110-C2500 31110-D5500
This is the in-tank, low-pressure electric fuel pump assembly. It supplies fuel to the engine-mounted high-pressure fuel pump on GDI models. The assembly includes the pump, strainer, and fuel level sending unit.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Kia Optima:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Kia Optima's Fuel Pump Failing?
- Distinguishing Between Fuel Pumps
- Common Symptoms of a Bad Electric Fuel Pump
- Choosing the Right Aftermarket Fuel Pump
- Pro Tip: Replace the Assembly
- Known Issues, Recalls, and Warranty Extensions
- Replacement Cost
- Frequently Asked Questions
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