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Pressure Test: Electrical

  1. Disconnect fuel line from carburetor. Install a "T" connector with a pressure gauge in the line and reconnect line to carburetor. Hold pressure gauge about 16" above fuel pump. Pinch off fuel return line (if equipped). Start engine and observe pressure.
  2. On General Motors (Corvette) Cross Fire System, plug Thermac vacuum port on TBI. Remove steel line between TBI's and install a pressure gauge using a "T" connector.
  3. Start engine and observe pressure. After pressure check, reconnect steel line. If pressure is not within specifications or varies greatly, replace fuel pump.
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