You'll find the *running* fuel pressure specification in your repair manual or online resources specific to your vehicle's year and engine. This will typically be in the range of 35-45 PSI. This is the pressure needed for the engine to run correctly once started.
To troubleshoot a starting problem, you need to:
* Measure the fuel pressure: Use a fuel pressure gauge to measure the pressure at the fuel rail. This should be done with the engine *off* and *on*. A low pressure reading (significantly below the running spec) when the key is turned to "on" (engine off) indicates a problem in the fuel pump, fuel filter, or fuel lines. Low pressure when running suggests similar issues or possibly a regulator problem.
* Consider other starting issues: Low fuel pressure is only one of many reasons a car might not start. Other possibilities include a bad battery, starter motor, ignition system problems, or other sensor failures.
In short: There isn't a specific "starting pressure," but getting a fuel pressure reading is crucial for diagnosing a no-start condition. Focus on getting the *running* fuel pressure spec from a reliable source (repair manual or reputable online auto repair database) to compare with your readings.
