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Engine Control System - 4.2L - Introduction: Maintenance GMC Envoy II

Testing & Diagnostics

Fuel Tank Draining Procedure

  1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(ref-200375-S07741338702005102000000) in Engine Electrical.
  2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-200385-S41061932852005102000000) in General Information.
  3. Loosen the fuel fill hose clamp (1).
  4. Disconnect the fuel fill hose (2) from the fuel tank.
  5. Use a hand or air operated pump device in order to drain as much fuel from the fuel tank as possible.

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