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Pressure Regulator Fuel Pressure

  1. Disconnect negative battery terminal. Using a shop rag wrapped around main fuel hose, disconnect main fuel hose from fuel line. Using 3-way connector, connect pressure gauge to main fuel line.
  2. Reconnect negative battery terminal. Start engine. Disconnect vacuum hose between pressure regulator and pressure regulator control valve at control valve. See Figure .
  3. With vacuum hose disconnected and engine idling, fuel pressure should be approximately 37 psi (2.6 kg/cm2 ). Reconnect vacuum hose to control valve and measure pressure. Fuel pressure should be approximately 28.5 psi (2 kg/cm2 ). If not, replace fuel pressure regulator.
Fig 1: RX7 Fuel Injection System Components
G35536