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Home >> Mazda >> 1997 >> B2300 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Basic Testing) >> Fuel System >> Fuel Pressure >> Fuel Pressure Regulator
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Fuel Pressure Regulator

WARNING: This page is about a different car, the 1997 Mazda B4000. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install Fuel Pressure Gauge (49 UN01 010) in fuel supply line. Start and operate engine at idle. Disconnect and plug fuel pressure regulator vacuum hose. Drive vehicle under heavy acceleration while observing fuel pressure. Fuel pressure should hold steady within 3 psi (.21 kg/cm2 ). If fuel pressure does not hold steady, check for plugged fuel filter.
  2. Connect a vacuum pump to fuel pressure regulator and apply vacuum. Fuel pressure should decrease as vacuum is increased. If fuel pressure is not as specified, replace fuel pressure regulator. If fuel pressure is as specified, check vacuum hose and vacuum source.
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