Important Considerations:
* Engine Running: The test MUST be performed with the engine running. You'll need a fuel pressure gauge that can be connected in-line with the fuel system.
* Key On, Engine Off (KOEO): Before starting the engine, you might see a slightly lower pressure (typically around 40-50 PSI) upon turning the key to the "on" position (but not cranking). This is normal as the fuel pump primes the system.
* System Pressure vs. Fuel Rail Pressure: Some testing procedures specify fuel rail pressure, which is usually very similar to system pressure but could have slightly different specifications. Consult a repair manual for your specific engine to confirm.
* Temperature: Fuel pressure can be affected by temperature. Ideally, the engine should be at operating temperature.
* Accurate Gauge: Using a reliable and accurate fuel pressure gauge is crucial for obtaining correct results. Cheap gauges can give inaccurate readings.
* Repair Manual: The best source of accurate information will be a repair manual specific to your 1997 Chevrolet Silverado 5.7L engine. This will provide the most definitive specifications and testing procedures.
Where to find this information:
* Repair Manual (e.g., Haynes, Chilton): These manuals are usually readily available online or at auto parts stores and provide detailed specifications and step-by-step instructions.
* Factory Service Manual: These are the most comprehensive but often more expensive.
* Online Forums: Searching online forums dedicated to Chevrolet Silverados and the 5.7L engine may uncover discussions about fuel pressure testing, though always verify information from multiple reliable sources.
Disclaimer: Working with fuel systems involves potentially dangerous conditions. If you're not comfortable working on your vehicle's fuel system, it's best to consult a qualified mechanic. Improperly handling fuel can lead to fire hazards.
