Mitsubishi Car 1999-05

Fuel Pressure Regulator

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Removal & Installation





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Fig. Remove the hose clamp on the fuel return line . . .



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Fig. . . . then disconnect the hose from the pressure regulator



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Fig. Remove the vacuum hose from the pressure regulator



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Fig. Remove the regulator-to-fuel rail retaining bolts, then remove the pressure regulator from the fuel rail



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Fig. Always replace the O-ring on the pressure regulator before reinstalling it

  1. Properly relieve the fuel system pressure as outlined earlier in this section.
  2.  
  3. Remove the vacuum hose from the fuel pressure regulator.
  4.  
  5. Disconnect the fuel return hose from the pressure regulator.
  6.  


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

  1. Remove the fuel regulator retainer bolts or remove the retaining snapring, then remove the fuel regulator from the fuel rail.
  2.  

To install:

  1. Replace the O-ring on fuel pressure regulator with a new one and coat it lightly with clean, thin oil.
  2.  
  3. Insert the regulator straight into the rail, then check that it can be rotated freely.
  4.  


NOTE
If it does not rotate smoothly, remove it and inspect the O-ring for deformation or damage.

  1. When properly installed, align the mounting holes. If equipped, install and tighten the retaining bolts to 8 ft. lbs. (11 Nm). If equipped, install the regulator retaining snapring.
  2.  
  3. Connect the fuel return hose to the pressure regulator.
  4.  
  5. Install the vacuum hose to the fuel pressure regulator.
  6.  
  7. Connect the negative battery cable and pressurize the fuel system. Inspect for leaks.
  8.  

 
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