Silverado 1500 2WD V6-4.3L (2007)
pressure should stabilize and remain constant.
1. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.
‹› If the fuel pressure decreases more than the specified value, perform the following procedure:
1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief (With CH 48027) Fuel Pressure Relief (Without CH 48027).
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 fuel pressure gage.
5. Close the valve on the J 37287.
6. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.
‹› If the fuel pressure drops, locate and replace the leaking fuel injector.
7. If the fuel system test normal, replace the fuel pump.
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.
‹› If the fuel pressure decreases more than the specified value, replace the fuel pump.
3. Remove the J 37287 and CH-48027.
4. Operate the vehicle within the conditions of the customers concern while monitoring the fuel trim and O2 parameters with a scan tool. The scan
tool parameters should not indicate a lean condition.
‹› If the scan tool parameters indicate a lean condition, test for a restricted fuel feed pipe, restricted fuel filter, or poor connections at the harness
connectors and ground circuits of the fuel pump. If all test normal, replace the fuel pump.
5. If the fuel system components test normal, refer to Symptoms - Computers and Control Systems. See: Powertrain Management/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: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
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Fuel Injector Replacement
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Fuel Sender Assembly Replacement (Regular Cab w/26 Gal Tank) Fuel Sender Assembly Replacement (Extended Cab w/26 Gal Tank) Fuel
Sender Assembly Replacement (Regular Cab w/34 Gal Tank)
