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Home >> GMC >> 1999 >> Forward Control 7.4 B >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Engine Controls - System & Component Testing) >> Fuel Systems >> Fuel Tank Leak Test >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to step numbers in diagnostic procedures.

  1. 1  - Perform this procedure in order to determine that no EVAP diagnostic DTC is present.
  2. 3  - This test is to locate fuel leakage in fuel lines.
  3. 4  - This tests for fuel leaks below fuel tank fuel level.
  4. 5  - This test is to locate fuel vapors escaping above fuel level in fuel tank.
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