Avalanche 1500 2WD V8-5.3L (2008)
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 pump module.
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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: 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 Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal) Tank) Fuel Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal)
Tank + E85) Fuel Hose/Pipes Assembly Replacement (1500 LWB - 117.3L (31 gal) Tank ) Fuel Hose/Pipes Assembly Replacement (1500 LWB -
117.3L (31 gal) Tank + E85)
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Fuel Injector Replacement
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Fuel Tank Fuel Pump Module Replacement (1500 Series) Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)
Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85) Fuel Tank Fuel Pump Module Replacement (2500 LWB -
98.4L (26 gal) Tank-Front) Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank-Rear)
