Record the behavior
Always empty, always full, intermittent, stuck at one point, or inaccurate only at certain fuel levels are useful distinctions.
INSTRUMENTS · 2002 · FUEL LEVEL
2002 Firebird Fuel Gauge Inaccurate or Inoperative
A bad fuel reading can originate at the tank sender, wiring or instrument cluster. The gauge display alone does not identify the failed part.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am. Configuration-specific equipment must match the vehicle before applying a circuit path.
Compare scan/cluster information where available
The factory diagnostic structure includes IPC scan data and a dedicated fuel-gauge symptom path. Use available data to separate the displayed value from the sender/circuit input.
Inspect the sender circuit before tank work
Check accessible connectors and wiring for damage or poor connections. Previous fuel-pump module work is especially relevant history.
DO NOT DROP THE TANK YET
Do not replace the sender or fuel-pump module until the sender/circuit side has been isolated from the IPC/display side.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. A symptom or DTC is a starting point, not a parts verdict.