LS1 · FUEL DELIVERY
LS1 Fuel Pressure
One clean year-specific answer is better than turning a familiar number into an unsupported 1998–2002 rule.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am 5.7L LS1. Do not apply this value to other years without the matching service information.
PAGE SCOPELS119982002
2002 specification
2002 LS1 · VIN G
55–60 psi / 380–410 kPa
Condition: ignition ON, engine OFF, fuel pump commanded ON.
Do not flatten the years
This page shows the 2002 F-body service value. It does not silently relabel one year's procedure as “1998–2002” just because all cars use an LS1.
What low pressure proves
Low measured pressure proves the fuel system is not meeting the applicable test condition. It does not by itself identify pump, electrical supply, restriction, regulator/module or leakage as the failed component.
Retention / leak-down
Use the exact applicable service procedure before condemning a component from pressure decay. A static number without its test condition is not a complete diagnosis.
FPV diagnostic order
- Verify year/application.
- Verify gauge accuracy and connection.
- Reproduce the specified KOEO/pump-command condition.
- Record pressure.
- If it fails, isolate the cause before authorizing a pump or other part.
2002 factory-reference record →LS1 Diagnostic Center →
FPV RULE
A failed pressure test authorizes diagnosis—not automatic fuel-pump replacement.