Generally, you'll find that the fuel pressure should be around 40-45 PSI (pounds per square inch) at idle, with the engine running, for an LT1 engine. The ZR1 will have a different specification. The pressure will be different when the engine is off.
Crucially, don't just rely on a single number. The more important consideration is that the fuel pressure remains *consistent* and within the specified range during different engine operating conditions. Fluctuations or pressures significantly outside the acceptable range point to a problem that needs attention.
To find the exact specifications:
1. Consult your owner's manual: This is the best place to start.
2. Use a reliable repair manual: Chilton's, Haynes, or a factory service manual will provide detailed specifications for your particular model.
3. Check online forums specific to C4 Corvettes: Owners often discuss fuel pressure issues and may have posted the correct values for your engine. But always double-check with a trusted source.
Attempting to diagnose a fuel pressure issue yourself can be dangerous. Incorrect fuel pressure can damage your engine. If you suspect a problem, it's best to consult a qualified mechanic.
