The pump running just for a second and shutting off when you turn the key to on sounds normal (that is how most cars seem to be) should just prime the system them when you turn the key to start it should and then running it will run the pump as normal. If you only have 10 psi it does sound like there is an issue ?

How does your fuel pump get power normally, is it through the loom getting a trigger from the PCM ?

I've never done a Hemi, but with the LSx setups and using factory PCMs you have to make sure you have them burned to remove the anti-theft stuff that turns stuff off after cranking from memory.