Silverado Classic 2500 4WD V8-6.6L DSL Turbo (2007)
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If less than 5 inches Hg of vacuum was observed on the vacuum gage during cranking, replace the fuel injection pump.
9. Disconnect and plug the chassis fuel supply line at the fuel tank.
10. Apply at least 25 inches Hg of vacuum to the supply hose with the J 23738-A and wait more than one minute for the system to stabilize. Repeat
this action 10 times.
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If the vacuum drops below 8 inches Hg of vacuum within 10 minutes, repair the air leak in the fuel supply line between the engine and fuel
tank.
11. Except for the fuel supply line, install all components and lines that were previously removed or disconnected.
12. Install the EN-47969 on the fuel supply line at the engine. Create a vertical loop in the hose to observe the incoming fuel for air bubbles.
13. Prime the fuel system 30 times to remove the air from the fuel hoses. Continue to prime the fuel system until the engine starts and runs.
14. Run the engine for at least 10 minutes to allow the fuel system to stabilize, and purge any air from the system.
15. IMPORTANT: Changes in engine speed can cause an increase of air bubbles that enter the EN-47969. An air pocket at the top of the
EN-47969 loop is considered a normal condition.
At a stabilized idle, observe the fuel entering the EN-47969 for air bubbles.
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If air bubbles were observed entering the transparent hose, test the fuel sender for leaks.
16. Install the fuel sender, fuel tank, and all fuel system connections and components that were previously disconnected. Leave the EN-47969
connected to the fuel supply line. Prime the fuel system 30 times to remove the air from the fuel hoses. Continue to prime the fuel system until the
engine starts and runs. Observe the fuel entering the transparent hose.
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If air bubbles are still present, refer to Diagnostic Aids.
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If no air bubbles are present, remove the EN-47969 and run the engine to ensure no fuel leaks exist.
REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Fuel Injection Pump Replacement
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Fuel Sender Assembly Replacement. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests and Procedures
