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HOMESERVICE MANUALSJEEP2008COMPASS LIMITED, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALFUEL SYSTEMFUEL DELIVERY-GASSTANDARD PROCEDUREFUEL CONTAMINATION
2008 Jeep Compass Limited, FWD, Standard

Fuel Contamination

2008 Jeep Compass Limited, FWD, StandardSECTION Fuel Contamination

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

  1. Remove all fuel from fuel tank. Use an appropriate fuel container. Dispose of contaminated fuel through the proper procedure of disposal. Clean fuel tank. This will require removal of the fuel tank to make sure all contaminated fuel is removed. See REMOVAL .
  2. Install fuel tank to vehicle, see INSTALLATION .
  3. Fill fuel tank with fuel.
  4. Check for DTC's and clear DTC's.
  5. Start vehicle and run engine for 15 minutes and turn off vehicle.
  6. Check for DTC's and clear DTC's.
  7. Road test vehicle.
  8. Check for DTC's.
NOTE: Dispose of Petroleum based products in a manner consistent with State, Federal, and Provincial Regulations.

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:

  1. 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.
  2. 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.
  3. Excessive smoke (black or white). This could indicate inability of the fuel system to inject the proper amount of fuel.
NOTE: If any of these conditions are exhibited after cleaning the fuel system, proceed to the appropriate fuel system information. Repair fuel system and or engine as necessary.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.