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How do I Fix code P0440 on a 1997 Chevrolet Blazer

Vehicle: 1997 Chevrolet Blazer 4.3 motor

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Hi there,

This code is for a large leak in the evap system. Here are some common causes.

  • Missing fuel cap
  • Defective or damaged fuel cap
  • Distorted or damaged Fuel Tank Filler Neck
  • Torn or punctured Evaporative system hose(s)
  • Defective Fuel Tank Sending Unit gasket or seal
  • Split or damaged Carbon Canister
  • Defective Evaporative Vent Valve and/or Evaporative Purge Valve
  • Defective or damaged fuel tank

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