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Test 67B - Inaccurate Fuel Gauge Operation

NOTE: Perform TEST 67A  before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring schematics, see WIRING DIAGRAMS  in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Using scan tool, read and record fuel level voltage. Add or remove 5 gallons of fuel. Read fuel level voltage. If fuel level voltage changed, system is currently functioning correctly. If voltage did not change, go to next step.
  2. Remove fuel tank sending unit. Inspect fuel tank for contamination. Repair as needed. Inspect sending unit for bent or sticking float arm. Repair or replace as needed. If tank and float arm are okay, replace fuel tank sending unit.
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