I had a 1985 T-Bird way back when.
It has a steel tank and is strapped in place.
Once you get the tank empty and unhook the power cables and fuel lines
you loosen the metal straps and it all drops down.
Bad news maybe..
Those hard plastic fuel lines are a bitch to get apart and put together
in cool weather.
If you live in an area with winter road salt the salt and dirt gets up
between the top of the tank and the bottom of the trunk floor, causing
the top of the tank to rust out with pin hole leaks.
The lock ring that holds the pump to the top of the gas tank is usually
badly rusted, preventing
a new fuel pump from having a good tight seal and prevents a good ground
power circuit for the pump.
Another typical point of failure for the fuel pump circuit is a power
relay tucked in next to the computer under the passenger kick panel.
When it goes bad your battery goes dead and after you recharge the
battery you notice every couple of seconds the fuel pump cycles, even
without the key in the ignition.
This was with the 3.8 V6 and C5 automatic.
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