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[doarmihai]

on quickserve this is the right procedure for High-Pressure System Leak Down Test
i don't know where rawze got his info
Connect INSITE™ electronic service tool.
Operate the engine.
Perform INSITE™ electronic service tool Fuel System Leakage Test.
Monitor the fuel rail pressure. Fuel rail pressure will rise and stabilize. This could take up to 5 minutes.
Shut the engine OFF and wait for it to completely stop.
Turn the keyswitch ON quickly.
Record the fuel rail pressure measured value. This is the first measurement.
Monitor for exactly 30 seconds.
Record the fuel rail pressure measured value again. This is the second measurement.
Subtract the second measured value from the first measured value.
A decay in fuel pressure greater than 1500 bar [21756 psi] in 30 seconds is an indication of a high-pressure fuel system leak.
See the appropriate troubleshooting symptom tree for repair direction.