Genuine Mazda MPV Fuel Pressure Regulator

Mazda MPV Fuel Pressure Regulator Parts and Q&A

• Pulse Dampener
  G601-20-180
  Q: How to check and replace the fuel pressure regulator on Mazda MPV?

  A:

  First of all, remove the pressure in the fuel system and disconnect the cable between the negative battery terminal. Uncouple the fuel line off the fuel rail and connect a fuel pressure gauge and then start the engine to ensure that there is no leakage around the leads of the fuel gauge. Disconnect the vacuum hose connection on the fuel pressure regulator and connect a handheld vacuum pump; monitor the fuel pressure gauge when vacuum is applied, you should see that the fuel pressure should rise when vacuum is low and the opposite also applies. Compare the fuel pressure reading with and without the vacuum present, be sure that the pressure in the fuel decreases with the increasing vacuum and compare them with the set values. Reconnect the vacuum hose to the regulator and inspect the fuel pressure at idle, should be equal to the specified pressure, verify the same and disconnect the vacuum hose and should notice that the pressure should rise to the maximum specified pressure instantly. With low fuel pressure, pinch fuel return line off and check the gauge; when the pressure fails to increase then could be a faulty Fuel Pump or could be restriction or leakage in the fuel feed line. When the pressure increases suddenly change the pressure regulator. On high indicated fuel pressure of the engine: stop the engine disconnect the fuel return line at the regulator and blow through the line; in the event of no blockage, replace the fuel pressure regulator. In case the pressure is not varying, ensure that there is no vacuum at the pressure regulator vacuum hose; when there is vacuum then replace the fuel pressure regulator. Install a vacuum gauge on the vacuum solenoid and vacuum test: When the engine is idling the vacuum solenoid must permit the vacuum to pass into the solenoid. Assuming the gauge shows nothing, turn the engine off, use a jumper wire to ground terminal on the vacuum solenoid, and apply battery voltage to the other terminal, and one should hear a distinct click of the solenoid operating correctly. In case the vacuum solenoid works properly, yet there remains no vacuum between the vacuum system and the fuel pressure regulator, get the ECU and the fuel pressure regulator vacuum system diagnosed in a dealer service department or repair shop. In case of replacement, release the system fuel pressure and remove the cable on the negative battery terminal. Unscrew the mounting bolts, remove the vacuum hose and fuel hose, and subsequently remove the pressure regulator out of the pressure regulator. Removal is the opposite of installation, one should have a new gasket and one should also check the occurrence of fuel leakage after fitting the pressure regulator.