Hello, I have a 2010 ZR1 that I recently bought. On a cold start, it will start and idle up and down then die. Then it will start normally and the second try. I had a tuner come by and tuned it and told me to turn the car on for 4 seconds to allow the fuel pump to pull the fuel up to the engine. It works right when I do that. But what could keep the fuel from draining the fuel pump after sitting all night? Thanks for your time.