How to Replace the Fuel Pressure Regulator on Subaru Impreza?

Depressurize the fuel system and disconnect the battery's negative cable. Remove and plug the fuel damper hoses, replacing clamps as needed. Install the damper and tighten clamps. For models after 2004, remove the air intake duct and disconnect the hose from the fuel pressure regulator. Remove the regulator from the fuel rail and replace the O-ring. Reinstall in reverse order, ensuring all bolts and clamps are secure. Check for leaks upon starting the engine.

Genuine Subaru Impreza Fuel Pressure Regulator

Fuel Tank Pressure Regulator

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9 Fuel Pressure Regulators found

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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA351
$121.01 MSRP: $175.38
You Save: $54.37 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2006 Subaru Impreza | STI | 2.5L H4 Turbo
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA252
$125.59 MSRP: $182.02
You Save: $56.43 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Regulator Assembly-Pressure
- Replaces: 22670AA251
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2007 Subaru Impreza | STI, STI Limited, WRX, WRX TR | 2.0L H4 Turbo, 2.5L H4 Turbo
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA400
$96.16 MSRP: $139.37
You Save: $43.21 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2011 Subaru Impreza | 2.5 GT, WRX, WRX Sport, WRXSS | 2.5L H4 Turbo
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA251
$125.59 MSRP: $182.02
You Save: $56.43 (31%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Replaced by: 22670AA252
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2006 Subaru Impreza | WRX | 2.0L H4 Turbo, 2.5L H4 Turbo
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA221
$111.57 MSRP: $161.70
You Save: $50.13 (31%)
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1999-2001 Subaru Impreza | Brighton, L, Outback, TS | 2.2L H4 Series
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA390
$88.68 MSRP: $128.52
You Save: $39.84 (31%)
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005 Subaru Impreza | Outback, RS | 2.5L H4
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA240
$111.57 MSRP: $161.70
You Save: $50.13 (31%)
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1999-2004 Subaru Impreza | Brighton, L, Outback, RS, TS | 2.2L H4 Series, 2.5L H4, 2.5L H4 SOHC
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Subaru Impreza Fuel Injection Pressure Regulator
Part Number: 22670AA440
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2011 Subaru Impreza | STI, STI Special Edition, STI Sport | 2.5L H4 Turbo
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Subaru Impreza Fuel Pressure Regulator
Part Number: 22670AA050
Product Specifications
- Other Name: Regulator Assembly-Pressure
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1993-1998 Subaru Impreza | Base, Brighton, L, L+, LE, LS, LX, Outback, RS | 1.8L H4, 2.2L H4, 2.2L H4 (New EVAPO), 2.5L H4 DOHC

Subaru Impreza Fuel Pressure Regulator

The Fuel Pressure Regulator of the Subaru Impreza keeps the pressure of the fuel in the range specified for the electronic fuel injection. Situated on the fuel rail, this Fuel Pressure Regulator has a spring and diaphragm that respond to engine vacuum supplied through a dedicated port. When there is no acceleration, the higher vacuum exerts a force against the spring, causing the diaphragm to open a passage to the fuel return line, which allows excess fuel to flow back to the tank, thereby preventing unnecessary pressure. When the throttle opens up, the vacuum drops. The spring in the Fuel Pressure Regulator restricts the return flow when this occurs. This action maintains the pressure required for a greater injector pulse width. A failure in the failed-closed Fuel Pressure Regulator brings high pressure with a rich mixture, whereas a broken spring or leak creates low pressure with a lean condition. Subaru Impreza compliance requires consistent operation. When you check the Subaru Impreza and the fuel pressure doesn't rise when pulling the vacuum hose off, the Fuel Pressure Regulator is bad. A Subaru Impreza with low pressure that stays low when the return line is pinched indicates a suspect pump, while pressure that rises indicates the regulator.

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Subaru Impreza Fuel Pressure Regulator Parts Questions & Experts Answers

Fuel Pressure Regulator
22670AA240
Q:
How to Replace the Fuel Pressure Regulator on Subaru Impreza?
Posted by Nick R.
A:
Depressurize the fuel system and disconnect the battery's negative cable. Remove and plug the fuel damper hoses, replacing clamps as needed. Install the damper and tighten clamps. For models after 2004, remove the air intake duct and disconnect the hose from the fuel pressure regulator. Remove the regulator from the fuel rail and replace the O-ring. Reinstall in reverse order, ensuring all bolts and clamps are secure. Check for leaks upon starting the engine.
Answered by Subaru Parts Specialist Anthony / Jan 14, 2025

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