LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System & Fuel System - 6.6L (LLY) - Troubleshooting & Diagnosis) >> Fuel Return System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
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 1 psi of air into the fuel return at the engine and listen for air flowing from the tank at the filler tube.
  4. If air flow was not detected, disconnect the fuel return line at the fuel sender and retest using 1 psi of air.
    • 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.
scientia non olet · About LEMON Manuals