Test Procedure
- Test the fuel composition using Fuel Composition Tester (J 44175) and Instruction Manual (J44175-3), or equivalents.
- If water appears in the fuel sample, clean the fuel system. Go to FUEL SYSTEM CLEANING and/or replace the fuel filter as necessary.
- Subtract 50 from the reading on the DMM to obtain the percentage of alcohol in the fuel sample. See the examples in the FUEL COMPOSITION TEST EXAMPLES table.
- If the fuel sample contains more than 15 percent ethanol, add fresh, regular gasoline to the vehicle's fuel tank.
- Test the fuel composition.
- If testing shows the ethanol percentage is still more than 15 percent, replace the fuel in the vehicle. Go to FUEL SYSTEM CLEANING .
FUEL COMPOSITION TEST EXAMPLES
| Example | Frequency - Hz | Subtract 50 | Ethanol Percent |
|---|---|---|---|
| A | 50 | -50 | 0 |
| B | 65 | -50 | 15 |
| C | 129 | -50 | 79 |