Fuel System Diagnosis - High Pressure Side: Notes
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Do not perform this procedure if you were not referred to this test from another diagnostic. Perform this test only when fuel is more than 65°F (18°C). All of the fuel return volumes are based on No. 2 diesel fuel. A vehicle with No. 1 diesel fuel will have higher values.