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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 Pump Electrical Circuit Diagnosis >> Circuit/System Verification

Circuit/System Verification

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Install the CH-48027  to the fuel system service port on the right front side of the engine. See Special Tools . Command the fuel pump ON with a scan tool and observe the fuel pressure gage. You should either hear or feel the relay click and the fuel pump should turn ON and OFF with each command. Fuel pressure should be a minimum of 69 kPa (10 psi) with the fuel pump running.

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