Envoy 2WD L6-4.2L (2008)
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If the fuel pressure is greater than the specified range, replace the fuel sender.
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If the fuel pressure is less than the specified range, test, inspect, and repair the items listed below. If all items test normal, replace the fuel
sender.
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Restricted fuel feed pipe
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Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
1. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.
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If the fuel pressure decreases more than the specified value, perform the following procedure:
1. Ignition OFF, relieve the fuel pressure.
2. Install the J 37287 between the fuel feed pipe and the fuel rail.
3. Open the valve on the J 37287.
4. Ignition ON, command the fuel pump relay ON with a scan tool and bleed the air from the CH-48027.
5. Command the fuel pump relay ON and then OFF with a scan tool.
6. Close the valve on the J 37287.
7. Monitor the fuel pressure for 1 minute.
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If the fuel pressure decreases more than 34 kPa (5 psi) within the specified time, locate and replace the leaking fuel injector(s).
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If the fuel pressure does not decrease more than 34 kPa (5 psi) within the specified time, replace the fuel sender.
2. Relieve the fuel pressure to 69 kPa (10 psi). Verify that the fuel pressure does not decrease more than 14 kPa (2 psi) in 5 minutes.
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If the fuel pressure decreases more than the specified value, replace the fuel sender.
3. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH-48027. The fuel pressure
should not drop off during acceleration, cruise or hard cornering.
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If the fuel pressure drops off, test, inspect, and repair the items listed below. If all items test normal, replace the fuel sender.
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Restricted fuel feed pipe
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Inspect the harness connectors and the ground circuits of the fuel pump for poor connections
4. If the fuel system tests normal, refer to Symptoms - Computers and Control Systems. See: Computers and Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Controls
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
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Fuel Hose/Pipes Replacement - Chassis
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Fuel Injector Replacement
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Fuel Sender Assembly Replacement
