Fuel Filter (In-Tank Assembly) > HYUNDAI SONATA IV (EF) & KIA OPTIMA / MAGENTIS (GD) 2.0L / 2.5L / 2.7L V6
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Genuine OEM Component (Hyundai-Kia MOBIS Original Equipment).
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Part Number: 31911-38204 (Official Hyundai/Kia OE Number).
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Replaces: Supersedes the earlier OE part number 31911-38202.
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Component Name: Fuel Filter Assembly / Element (Filter unit located inside the fuel pump module).
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Primary Applications (Engine Specific): This filter is essential for the mid-generation sedans:
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Hyundai Sonata IV (EF Chassis): Fits various Gasoline models, including 2.0L and 2.7L V6 engines (approx. 2001–2005). Confirms your Sonata EF.
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Kia Optima / Magentis (GD/MS Chassis): Fits 2.0L and 2.5L V6 Gasoline models (approx. 2001–2005). Confirms your Optima 2004.
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Also Fits: Hyundai Grandeur XG and Kia Amanti/Opirus models of that era.
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Filter Type: This is an in-tank filter, meaning it is integrated into the fuel pump module and located inside the fuel tank, typically accessed from beneath the rear seat.
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Key Function: Filters impurities and protects the fuel system, while also being integrated with components for fuel pressure regulation.
This is a Genuine OEM Fuel Filter Assembly, identified by the Hyundai/Kia MOBIS part number 31911-38204. The search results confirm this is the correct factory-original filtration unit for the fuel pump module used in the final phase of the fourth-generation Hyundai Sonata (EF chassis) and the closely related first-generation Kia Optima / Magentis (GD/MS chassis), covering your 2004 model year vehicles.
The function of this in-tank fuel filter is critical for the reliable operation of the engine:
MPI System Protection: The engines (including the 2.0L L4 and the 2.7L V6) rely on Multi-Port Injection (MPI) that requires clean, contamination-free fuel. The filter acts as the primary barrier, preventing fine particulate matter from clogging the injectors or causing premature failure of the electric fuel pump motor.
Pressure Regulation: For these mid-2000s models, the fuel filter assembly is an integral, non-separable part of the fuel pump module and often houses the fuel pressure regulator. Using the Genuine MOBIS Part is essential to ensure the correct filter specifications, proper sealing, and, most importantly, accurate fuel pressure regulation for stable engine performance.
Correct Replacement Type: The EF/GD platform uses an in-tank filter, requiring access via the fuel tank opening, usually by lifting the rear seat cushion.
Fitment Assurance: The part number 31911-38204 is verified as the correct genuine in-tank fuel filter for the Hyundai Sonata EF and Kia Optima/Magentis 2004 gasoline engine models.
Compatible Vehicle (Primary Applications - Check VIN for final confirmation):
Hyundai Sonata IV (EF) 2.0L / 2.7L V6 Gasoline (2001–2005)
Kia Optima / Magentis (GD/MS) 2.0L / 2.5L V6 Gasoline (2001–2005)
Hyundai Grandeur XG 2.5L / 3.0L / 3.5L Gasoline (2002–2005)
Part Number:
✔ 31911-38204 (Fuel Filter Assembly - Genuine Hyundai/Kia MOBIS OE)
Replaces: 31911-38202
Part Type:
✔ Fuel Filter (In-Tank Assembly / Element) (Genuine Part, Sonata EF / Optima GD Specific)
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