It runs 10-20 seconds (Feed in tank Pump) , Plus you need to allow the internal Clock to re-set before it will run ... again ... W/O engine running.
Also it needs to make more then 45/50PSI to overcome the COV in the CP4 to open the FCA feed circuit, plus you need to make more then 1800PSI Cranking rail Pressure for the Pressure sensor to send signal to ECM/PCM to Fire the hot hole. This is 1 of many reasons why it won't start.