The Subaru Impreza is a compact car manufactured since 1993. The installation procedure for a fuel pressure regulator in an Impreza depends primarily on the engine. A late-model Impreza has several choices of engines, with the most common being a 4-cylinder 2.5-litre engine. The fuel pressure regulator for this engine is on the fuel rail next to the fuel injectors and is accessible from the top of the engine compartment.
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Things you need
- Socket wrench set
Detach the electrical connector from the fuel pump relay to disable the fuel pump. Start the engine and allow it to stall. Engage the starter for at least five seconds to ensure the fuel system is empty. Attach the electrical connector for the fuel pump relay.
Remove the cable to the negative battery terminal with a socket wrench. This ensures you don't start the engine inadvertently while replacing the fuel pressure regulator. Detach the vacuum line to the fuel pressure regulator.
Disconnect the nuts that attach the fuel line to the fuel pressure regulator with a socket wrench. Detach the fuel line and remove the clamp on the fuel pressure regulator. Disconnect the regulator and discard its O-ring.
Mount a new O-ring onto the new fuel pressure regulator and install the fuel pressure regulator. Attach the clamp and connect the fuel line to the fuel pressure regulator with a socket wrench. Attach the vacuum line to the fuel pressure regulator.
Connect the cable to the negative battery terminal with a socket wrench. Start the engine and check for fuel leaks.
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