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Diagnostic Aids
- If the vehicle is equipped with a fuel module, the module must be disconnected before performing the fuel system pressure test.
- Fuel system is under pressure. To avoid fuel spillage, see FUEL SYSTEM PRESSURE RELIEF (GASOLINE) in REMOVE/INSTALL/OVERHAUL
article.
- On V6 or V8 engines, fuel pressure drops to almost zero psi after pump shuts "OFF".
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.