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Fuel Tank Leakage: Notes

NOTE: If a leak in the tank ventilation system is indicated by CHECK ENGINE light in instrument cluster lighting up, a leak test must be carried out. Fault memory of DME control unit must be read out using BMW or generic scan tool. If sensors are okay, then begin leak test. Ensure following conditions are observed to obtain plausible measuring results:
  • Contents of fuel tank: 25-75% full.
  • Park vehicle at least 2 hours before test so fuel temperature is approximately that of ambient temperature. Ideal fuel temperature is approximately 50-68°F (10-20°C).
  • Never refuel vehicle directly prior to leak test due to strong emission of gas by fresh fuel.
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