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Home >> Buick >> 2005 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Repair Instructions >> Fuel Pressure Relief Procedure

Fuel Pressure Relief Procedure

Tools Required: J 34730-1A  Fuel Pressure Gauge. See Special Tools .

CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.
  1. Disconnect the negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
    2. Fig 1: Removing/Replacing Fuel Injector Sight Shield & Fuel Pressure Connection Cap
    GM49594Courtesy of GENERAL MOTORS CORP.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L36) in Engine Mechanical.
  3. Remove the fuel pressure connection cap.
  4. Wrap a shop towel around the fuel pressure connection while connecting the J 34730-1A  in order to avoid spillage. See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
  5. Install the bleed hose into an approved container and open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
  6. Drain any fuel remaining in the fuel pressure gauge into an approved container.
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