GM Service Manual Online
For 1990-2009 cars only

Fuel Tank Draining for Chevrolet Chevrolet W-Series Commercial W4 (W3500/W4500) 2009

Fuel Tank Draining w/o L59

    Warning: Refer to Gasoline/Gasoline Vapors Warning in the Preface section.

  1. Remove the fuel filler cap.
  2. Use a hand or air operated pump device in order to drain as much fuel through the fuel tank filler pipe opening as possible.