Pre-Service Procedures

NOTE: The fuel pressure release procedure must be performed prior to service on the following components:
- fuel injection supply manifold
- fuel injectors
- fuel filter/coalescer
- fuel pressure regulator
- intake manifold
- fuel shut off valve solenoid
- fuel temperature sensors
- fuel pressure sensors

PROCEDURE
1. Remove the fuel pump relay from power distribution box and harness.
2. Disconnect battery ground cable.

NOTE: When the battery has been disconnected or reconnected, some abnormal drive symptoms may occur while the Powertrain Control Module (PCM) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy.

3. Connect Fuel Rail Pressure Test and Venting Kit 134-00116 and Rotunda Venting Hose Assembly 134-00118 or equivalent(s) at the schrader valve on the fuel injection supply manifold and vent stack.

CAUTION: Tester kit valve should be closed.

4. Connect Rotunda Grounding Cable 134-00121 or equivalent to the fuel injection supply manifold and Earth Ground.
5. Gradually open the testing kit valve to relieve the fuel pressure in the vehicle fuel system and allow it to escape.

NOTE: A small amount of pressure, 34 kPa (5 psi), will remain in the injection supply manifold.

CAUTION: High pressure still exists in the fuel tanks and upstream of the quarter-turn manual fuel line shut off valve if closed.

6. Close the bleed valve on Rotunda Fuel Rail Pressure Tester 134-00116 or equivalent and remove from vehicle.

WARNING: If the fuel tubes continue to vent or pressure remains after one minute or more, fuel tank solenoids are stuck open. Do not disconnect the fuel tubes while pressure remains or personal injury may occur.