Subaru Legacy BN/BS (2015-2019) Service Manual: Fuel pressure inspection
1. Release the fuel pressure. Fuel > PROCEDURE 2. Open the fuel filler lid and remove the fuel filler cap. NOTE: This operation is required to release the inner pressure of the fuel tank. 3. Disconnect the fuel delivery tube from the fuel delivery pipe, and connect the fuel pressure gauge. CAUTION: • Be careful not to spill fuel. • Catch the fuel from the tubes using a container or cloth. (1) Remove the clip (A) securing the fuel delivery tube to the fuel pipe assembly. (2) Attach ST to the fuel pipe assembly and push ST in the direction of arrow mark to disconnect the quick connector of the fuel delivery tube.
(3) Connect the fuel pressure gauge with ST1 and ST2. CAUTION: • Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe. • Make sure that the quick connector is securely connected. NOTE: ST1 is a SUBARU genuine part.
4. Start the engine. 5. Check the fuel pressure after warming up the engine. NOTE: • The fuel pressure gauge registers 10 to 20 kPa (0.1 to 0.2 kgf/cm2, 1 to 3 psi) higher than standard values during high-altitude operations. • Check or replace the fuel pump and fuel delivery line if the fuel pressure is out of the standard. Fuel pressure: Standard 340 — 400 kPa (3.5 — 4.1 kgf/cm2, 49 — 58 psi) 6. After inspection, install the related parts in the reverse order of removal. CAUTION: • Before removing the fuel pressure gauge, release the fuel pressure. • Be careful not to spill fuel. • Catch the fuel from hoses and tubes using a container or cloth. • Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe. • Make sure that the quick connector is securely connected. NOTE: • When disconnecting the ST1 or fuel delivery tube, install the ST3 to the fuel pipe assembly or to ST2, and press the ST3 in the direction of arrow to disconnect the ST1 or the quick connector of the fuel delivery tube.
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