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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
23,857 Posts
Welcome to Allpar. The fuel gauge signal is carried to the PCM from the tank sender on a dark blue wire, from there to the cluster gauge is over the CCD communications bus. The gauge is not hardwired. If the sender ground was bad, the fuel gauge would read overfull.
If the fuel pump relay is clicking as well, I suspect a wiring problem (high resistance) under the hood. Maybe near the battery where corrosion can take place and underneath the nearby PDC (fuse/relay box) where corrosion can hide and fester. PCM connectors and body grounds can also corrode. If the PCM has a voltage drop, the relay can cycle repeatedly and the PCM communications bus will go down causing both of your issues.
There may be no fault codes.
You may want to consider looking for a factory service manual before buying more parts. Sometimes the larger libraries have these:
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