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Fuel Pressure Regulator

WARNING: This page is about a different car, the 1995 Mazda B4000, 1995 Mazda B3000, and 1995 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition is off. Connect fuel pressure gauge to Schrader valve on fuel rail. Ensure manifold vacuum supply tube is connected to fuel pressure regulator. Start engine, and run it for 10 seconds. Stop engine, and wait 10 seconds. Start engine, and operate it for 10 seconds. Stop engine, and remove pressure regulator vacuum hose. Check for fuel in vacuum hose.
  2. If fuel is present, replace fuel pressure regulator. If fuel is not present, plug pressure regulator vacuum hose. Install a vacuum pump to pressure regulator. Start engine, and observe fuel pressure. Apply vacuum.
  3. If fuel pressure changes as vacuum is applied, check vacuum signal to pressure regulator and repair vacuum hoses as necessary. If fuel pressure does not change as vacuum is applied, replace fuel pressure regulator.
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