HomeAir and Fuel Delivery > Fuel Injection System and Related ComponentsStandard Ignition PR391 Fuel Injection Pressure Regulator
Part #: PR391

Standard Ignition PR391 Fuel Injection Pressure Regulator

16 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Kia and Hyundai, Magentis, Optima, Santa Fe, and Sonata
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Reliable Fuel Injection Pressure Regulator for Hyundai and Kia Vehicles

The Standard Ignition PR391 fuel injection pressure regulator is designed to maintain consistent fuel pressure in gas fuel systems. Engineered with durable steel construction and a chrome finish, this regulator ensures reliable performance for Hyundai and Kia models including the Magentis, Optima, Santa Fe, and Sonata.

  • Constructed from high-quality steel for durability
  • Direct mounting type for straightforward installation
  • Angled nipple orientation for optimal fuel line connection
  • Chrome part finish with silver regulator finish for corrosion resistance
  • Includes caution sheet for safe handling and installation
  • Single port design compatible with gas fuel systems

Durable Construction and Precise Fuel Regulation

The PR391 fuel injection pressure regulator from Standard Ignition is built to provide consistent fuel pressure control, which is critical for efficient engine operation. Its steel material and chrome finish offer resistance to wear and corrosion, extending the component's service life. The angled nipple orientation facilitates proper fuel line alignment, reducing stress on connections. Designed specifically for gas fuel systems, this regulator supports the fuel injection system's function by maintaining the correct pressure required for optimal combustion.

Compatible Hyundai and Kia Models

This fuel injection pressure regulator is compatible with several Hyundai and Kia vehicles, including the Hyundai Magentis and Sonata, as well as the Kia Optima and Santa Fe. Using the Standard Ignition PR391 ensures proper fitment and function within these models' fuel injection systems.

Common Applications and Issues Addressed

  • Maintains stable fuel pressure for consistent engine performance
  • Prevents fuel pressure fluctuations that can cause rough idling
  • Helps avoid fuel leaks due to worn or damaged regulators
  • Supports efficient fuel delivery to improve engine responsiveness
  • Reduces risk of engine stalling related to fuel pressure irregularities

Installation Notes and Tips

Installation of the Standard Ignition PR391 fuel injection pressure regulator requires direct mounting to the fuel system. Ensure the angled nipple orientation aligns correctly with the fuel line to prevent kinks or leaks. Follow the included caution sheet carefully to handle the component safely and avoid damage. It is recommended to inspect related fuel system components during installation to ensure overall system integrity.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications. The PR391 fuel injection pressure regulator undergoes rigorous quality control to ensure reliable performance. While this product is not classified as an automotive performance item, it is backed by Standard Ignition's commitment to quality and durability. Please refer to Standard Ignition's warranty policy for specific coverage details.

BrandStandard Ignition
Part NumberPR391
Automotive Performance ItemNo
ContentsIncludes Caution Sheet
Fuel TypeGas
FunctionsRegulator
MaterialSteel
Mounting TypeDirect
Nipple OrientationAngled
Part FinishChrome
Regulator FinishSilver
Regulator MaterialSteel

This part fits 16 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2006KiaMagentis2.4LL4N/A
2006KiaOptima2.4LL4N/A
2005KiaMagentis2.4LL4N/A
2005KiaOptima2.4LL4N/A
2004HyundaiSanta Fe2.4LL4N/AFits models up to June 2004.
2004HyundaiSonata2.4LL4N/AFits models up to June 2004.
2004KiaMagentis2.4LL4N/AFrom 4/14/04
2004KiaOptima2.4LL4N/AFrom 4/14/04
2003HyundaiSanta Fe2.4LL4N/A
2003HyundaiSonata2.4LL4N/A
2002HyundaiSanta Fe2.4LL4N/A
2002HyundaiSonata2.4LL4N/A
2001HyundaiSanta Fe2.4LL4N/A
2001HyundaiSonata2.4LL4N/A
2000HyundaiSonata2.4LL4N/A
1999HyundaiSonata2.4LL4N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

158-07462-19859240993530138300A401-00335G1485800-503FP10376PR4256

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.