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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls - System & Component Testing - 6.6L) >> Fuel Systems >> Fuel Tank Leak Test >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Before servicing any electrical component, the ignition must off or in LOCK position. All electrical loads must be off, unless instructed otherwise in these procedures. Disconnect battery cables.
  2. Drain fuel tank.
  3. Remove fuel tank.
  4. Cap fuel feed tube and fuel return tube on fuel sender.
  5. Connect a piece of hose to the filler tube nipple and plug the opposite end.
  6. Submerge fuel tank in water or apply a soapy solution to the outside of tank.
  7. Apply 5 psi (35 kPa) of air pressure to the vent hose of the fuel tank. A leak will show up as bubbles.
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