Envoy, Rainer, Trailblazer 2006-2007

Testing

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Fig. Fuel pump module connector view: (1) ground, (2) fuel level sensor signal (primary), (3) low reference, (4) fuel pump supply voltage

  1. Remove the fuel pump assembly from the vehicle.
  2.  
  3. Using an ohmmeter, connect the probes to fuel level sending unit terminals 1 and 2 of the fuel pump module electrical connector.
  4.  
  5. Position the float in the down position (this indicates empty) and note the reading on the ohmmeter.
  6.  
  7. Move the float to the up position (this indicates full) while watching the ohmmeter.
  8.  
  9. If the fuel level sending unit resistance does not change smoothly as the float travels from the down to up (empty to full) position, replace the fuel level sending unit assembly.
  10.  

 
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