LS400 1990-1997

Relieving Fuel System Pressure

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CAUTION
Failure to relieve fuel pressure before repairs or disassembly can cause serious personal injury and/or property damage. Fuel pressure is maintained within the fuel lines, even if the engine is OFF or has not been run in a period of time. This pressure must be safely relieved before any fuel-bearing line or component is loosened or removed. On vehicles equipped with inflatable restraints or air bag systems, wait at least 90 seconds after disconnecting the battery cable before performing any other work. The backup power will keep the restraint system energized for a period of time after the battery is disconnected.

  1. Remove the fuse for the electronic fuel pump.
  2.  
  3. Start the engine until the engine stalls.
  4.  
  5. Disconnect the negative battery terminal.
  6.  
  7. Place a catch-pan under the joint to be disconnected. A large quantity of fuel may be released when the joint is opened.
  8.  
  9. Wear eye or full face protection.
  10.  
  11. Place a shop towel over the area and slowly release the joint using a wrench of the correct size.
  12.  
  13. Allow the any fuel left in the line to bleed off slowly before fully disconnecting the joint.
  14.  
  15. Plug the opened lines immediately to prevent fuel spillage or the entry of dirt.
  16.  
  17. Dispose of the released fuel properly.
  18.  
  19. After connecting fuel lines, install the fuse for the fuel pump and start the engine.
  20.  
  21. Check for leaks and repair as needed.
  22.  

 
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