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Pressure Test

  1. Connect fuel pressure gauge to pressure relief valve on fuel rail assembly. See Figure . Pressurize fuel system by starting and running engine or turning ignition on and off several times.
  2. Fuel pressure should be 35-45 psi (2.5-3.0 kg/cm2 ). If pressure is not correct, check to ensure ignition coil is connected. Ensure that injectors, fuel pressure regulator or fuel delivery lines and connections are not leaking.
  3. If no pressure reading can be obtained, check fuel pump circuit. When fuel pressure is obtained, turn key off. Pressure must not drop more than 4 psi (.3 kg/cm2 ) within 2 minutes after ignition is turned off.
  4. Fuel pump is good if following conditions are met: Operating pressure is correct, fuel flow is at least 7.5 oz. (.2 liters) in 10 seconds, and fuel pressure remains at a minimum of 31 psi (2.1 kg/cm2 ) immediately after deactivation. If all conditions are met, check for engine or electrical problems.
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