Hello,
It sounds like the fuel sending unit is faulty on your vehicle.
Since the Ford Falcon is not a US spec car, I do not have diagrams to share with you.
However the fuel sending unit is in the tank, it is part of the fuel pump.
It basically a float that goes up and down with the fuel level.
Over time the contact for that float goes bad and cause it to give incorrect reading to the gauge.
You might find these articles helpful:
https://www.2carpros.com/articles/how-a-fuel-pump-works
https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump
Please let me know of any questions.
Thank you.
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Sunday, August 1st, 2021 AT 9:46 PM