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Home >> Eagle >> 1997 >> Talon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - Turbo >> Fuel System >> Fuel Pressure
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Fuel Pressure

  1. Disconnect negative battery cable. Release fuel pressure. See FUEL PRESSURE RELEASE under FUEL SYSTEM.
  2. Fuel supply line must be disconnected from rear of fuel rail. Cover fuel supply line with shop towel, as some residual fuel pressure may exist in fuel rail. Remove bolts and fuel supply line. Install Hose Adapter (MD998742), Adapter Hose (MD998709) and fuel pressure gauge on end of fuel rail. Reconnect fuel supply line.
  3. Apply battery voltage to fuel pump check terminal. Fuel pump check terminal is a 1-pin Black connector located on firewall, near battery and contains a Black/Blue wire. See Fig 1 . Check for fuel leaks. Disconnect battery voltage from fuel pump check terminal.
    Fig 1: Identifying Fuel Pump Check Terminal
    G96E29417Courtesy of CHRYSLER CORP.
  4. Start engine and allow engine to idle. Note fuel pressure. Fuel pressure with engine idling should be 33 psi (2.3 kg/cm2 ).
  5. Disconnect and plug vacuum hose at fuel pressure regulator, located on front (timing belt end) of fuel rail. Note fuel pressure with engine idling. Fuel pressure should be 42-45 psi (2.9-3.2 kg/cm2 ).
  6. Accelerate engine several times and then allow engine to idle. Note that fuel pressure does not decrease.
  7. If fuel pressure is the same with or without vacuum hose connected to fuel pressure regulator, check for defective vacuum hose. If vacuum hose is okay, check for defective fuel pressure solenoid and control system. If problem exists in fuel pressure solenoid and control system, a Diagnostic Trouble Code (DTC) will be stored in Engine Control Module (ECM). See the TESTS W/CODES - TURBO article.
  8. If fuel pressure exceeds specification, go to step 11). If fuel pressure is less than specified, check for clogged fuel filter. Fuel filter is located on frame rail, near fuel tank. Replace fuel filter if clogged, and recheck fuel pressure. If fuel pressure is still not within specification, go to next step.
  9. Check for fuel pressure in fuel return hose at fuel pressure regulator. Fuel pressure regulator is located on front (timing belt end) of fuel rail.
  10. If fuel pressure exists in fuel return hose, fuel pressure regulator is leaking. If no fuel pressure exists in fuel return hose, low fuel pressure is caused by defective fuel pump. Fuel pump is located in fuel tank. Replace components as necessary. See the REMOVE/INSTALL/OVERHAUL - TURBO article.
  11. If fuel pressure exceeds specification, check for restricted fuel return hose or pipe. If fuel return hose or pipe are not restricted, check for binding valve in fuel pressure regulator. Fuel pressure regulator is located on front (timing belt end) of fuel rail. See REMOVE/INSTALL/OVERHAUL - TURBO article. Once correct fuel pressure is obtained, go to next step.
  12. After the engine has been running, shut engine off and observe fuel pressure. Fuel pressure should be maintained for at least 2 minutes. If fuel pressure is maintained for at least 2 minutes, go to step 14). If fuel pressure is not maintained for at least 2 minutes, go to next step.
  13. If fuel pressure decreases gradually after engine is stopped, check for leaking fuel injector or defective valve seat in fuel pressure regulator. If fuel pressure decreases quickly after engine is stopped, check valve in fuel pump is defective and fuel pump must be replaced. Go to next step.
  14. Ensure ignition is off. Release fuel pressure. Remove test equipment. Reinstall fuel supply line using NEW "O" ring. Tighten fuel supply line bolts to 43 INCH lbs. (4.9 N.m). Apply battery voltage to fuel pump check terminal and check for fuel leaks.
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