Express 1/2 Ton Van V6-4.3L VIN X (2003)
9. Pour the fuel sample from the beaker (1) into theJ 44175 , until the level of the fuel is at the top of each fuel test port (2).
IMPORTANT: DO NOT allow any substances other than gasoline, ethanol/gasoline blends, air, or acetone into the test ports of the fuel composition
tester. Contaminants in the J 44175 could result in misdiagnosis.
10. Observe the diagnostic LEDs on the fuel composition tester. If the red fuel diagnostic LED is illuminated, a fuel contamination condition exists.
Refer to Fuel System Cleaning.
11. Measure the output frequency of the fuel composition tester.
Fuel Composition Test Examples
12. Subtract 50 from the reading on the DMM to obtain the percentage of alcohol in the fuel sample. Refer to the examples in the table.
13. If the fuel sample contains more than 10 percent ethanol, add gasoline to the fuel tank or replace the fuel in the vehicle.
