The WAJ Fuel Pump Module
31110-C1200 is a precision-engineered component designed to restore optimal fuel delivery in Hyundai Sonata (2011–2018) and Kia Optima (2011–2018) models equipped with 2.0L/2.4L G4KD/G4KE engines. This assembly integrates advanced fuel management technologies to meet OEM performance standards while enhancing durability in demanding driving conditions.
Core Technical Specifications
Flow Rate: 140–180 L/h at 3.5–4.2 bar pressure, calibrated for direct injection systems.
Material Construction:
Reinforced nylon housing with ethanol-resistant fluoropolymer seals (E10–E15 compatible).
Stainless-steel impeller and brushless motor rated for 120,000+ mile service life.
Integrated Components: Combines fuel pump, strainer, fuel level sensor, and pressure regulator for simplified installation.
Compatibility & Fitment
Vehicle Model Engine Options Model Years
Hyundai Sonata 2.0L G4KD, 2.4L G4KE 2011–2018
Kia Optima 2.0L G4KD, 2.4L G4KE 2011–2018
Kia Optima Hybrid 2.4L G4KE Hybrid 2013–2016
Note: Confirm compatibility via VIN decoding or cross-checking OEM part numbers
31110-C1200 and 31110-2B100.
Performance Advantages
Precision Fuel Pressure Control
Maintains ±0.1 bar pressure variance during rapid acceleration, preventing engine stutter.
Self-priming design eliminates vapor lock in temperatures exceeding 40°C.
Diagnostic Integration
OBD-II compatible for real-time monitoring of fuel trim values (STFT/LTFT) and error codes (P0087/P0191).
Built-in CAN-BUS communication for Hyundai/Kia GDS diagnostic systems.
Durability Enhancements
Bench-tested for 1,000+ hours under simulated 200,000 km driving cycles.
Validated for -25°C cold starts and 50°C high-humidity environments.
Installation Protocol
Pre-Installation Checks
Depressurize the fuel system via the fuse box (15A Fuel Pump Relay).
Clean fuel tank interior using ISO 12010-1 compliant solvents.
Critical Steps
Secure electrical connectors with dielectric grease to prevent corrosion.
Use torque-limited clamps (6–8 Nm) on fuel lines to avoid overtightening.
Post-Installation Validation
Prime the system for 10 seconds before ignition to purge air pockets.
Conduct a 15-minute road test to verify idle stability and WOT performance.
Maintenance Best Practices
Fuel Quality: Use TOP TIER™ gasoline with <10% ethanol content.
Filter Replacement: Replace in-tank strainer every 75,000 miles.
Winter Precautions: Add fuel-line antifreeze in sub-zero climates.
Certifications & Compliance
Exceeds ISO 16750-2 vibration resistance standards.
Validated under Kia MS 350-06 fuel system durability protocols.
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