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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 924 (Engine Controls And Fuel - 6.6L (LMM) - Diagnosis & Troubleshooting) >> Fuel Return System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: DO NOT apply more than the specified air pressure to the return line.
  1. Disconnect the fuel return line at the engine. Refer to Metal Collar Quick Connect Fitting Service .
  2. Remove the fuel filler cap.
  3. Apply 6.9 kPa (1 psi) of pressure air into the fuel return at the engine. Air flow should be detected at fuel filler tube.
  4. If air flow was not detected at the fuel filler tube, disconnect the fuel return line at the fuel sender and apply 6.9 kPa (1 psi) of air pressure into the fuel return line at the engine.
    • If air flow was present, replace the fuel sender assembly.
    • If no air flow was present, inspect for a restricted or a damaged fuel return line. Repair or replace the fuel return line.
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