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Fuel Pressure Regulator Hold Pressure

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable.
  2. Locate data link connector in left side of engine compartment. Connect a jumper wire between data link connector terminals F/P and GND. See Figure Turn ignition on for 10 seconds to operate fuel pump. Turn ignition off and disconnect jumper wire. Carefully pinch fuel return hose close. Wait 5 minutes and observe fuel pressure.
  3. Fuel pressure should be more than 21 psi (1.5 kg/cm2 ). If fuel pressure is not as specified, replace fuel pressure regulator.
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