Diagnostic Aids
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- Contaminated fuel or incorrect fuel may cause erratic fuel pressure.
- A low fuel condition may cause driveability concerns.
- Water or contaminated fuel may cause driveability concerns. Refer to Contaminants-in-Fuel Diagnosis .
- When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank.
- High fuel injector return flow may cause fuel pressure control concerns.
- The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters may relate to driveability complaints.