pauliehcfr

I have a 2004 545. Every so often, after driving and shutting the car off, I'll go to restart it approximately 10-20 minutes later and it will crank but won't fire up. If it does fire up, it immediately stalls. If I turn the key off and retry, it will start no problem. There are no fault codes stored. I'm thinking possible fuel pump or leaking fuel injector. Anyone know what the fuel pressure specs are when running and off and what the acceptable tolerances are? Anyone else experience this and successfully diagnosed/fixed? Thanks