Some Ford Thunderbird owners report experiencing a lack of power to the coil and fuel pump after swapping engines. This issue may arise from a lack of power on the red with green wire at the coil or ignition module, potentially indicating a problem with a fusible link protecting that circuit. Additionally, those converting to a coil or ignition system requiring 12v full-time might need to run a separate wire between the ignition switch and the coil. Owners are also advised to verify the functionality of the electric fuel pump by turning the pump switch on and cranking the engine to build oil pressure, which should close the oil pressure switch. Furthermore, inadequate fuel pressure can occur if the pump and tankage are not properly inspected, along with the accelerator pump in the carburetor. To accurately diagnose fuel pump issues, some owners recommend using a fuel pump pressure/vacuum gauge to detect problems like a damaged diaphragm that may not show under no load conditions.
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