Fuel Delivery and Air Induction: Service and Repair

FUEL CONTAMINATION

If an engine's fuel supply has been contaminated, the following procedure must be followed:

NOTE: Dispose of Petroleum based products in a manner consistent with State, Federal and Provincial Regulations.

1. Use an appropriate fuel container and remove all fuel from fuel tank. Dispose of contaminated fuel through the proper procedure of disposal.
2. Remove, clean, reinstall and refill fuel tank.
3. Check for DTC's and clear DTC's.
4. Start vehicle and run engine for 15 minutes and turn off vehicle.
5. Check for DTC's and clear DTC's.
6. Road test vehicle.
7. Check for DTC's.

NOTE: If any of the following conditions are exhibited after cleaning the fuel system, proceed to the appropriate fuel system information and repair fuel system or engine as necessary.

The engine should then be evaluated to determine if the contaminated fuel has caused any damage to the fuel system and or engine. Indicators that the fuel system and or engine has been damaged are the following:

- Unstable fuel rail pressure. This can manifest itself as instability at idle speeds, excessive undershoot/overshoot at engine start, or excessive undershoot/overshoot when the engine operating conditions change. A typical engine response to a large rail pressure undershoot would be a decrease in engine speed or engine stall.
- Excessive noise from the engine. This could indicate poor rail pressure control or the inability of the injection system to inject the proper amount of fuel.
- Excessive smoke (black or white). This could indicate inability of the fuel system to inject the proper amount of fuel.