Samuel L Jackson

Hi all, I just recently purchased a 08 957tt with excellent service history. It has been amazing so far! I do have an issue where when the car has sat for a long time, hours, it takes a little longer to start. I have noticed that if I put the key in and turn the car on but not the engine, and wait for 30 seconds, it starts perfectly fine. I am thinking it's loosing fuel pressure but not sure how to verify what part needs replacement. Anyone have ideas on how I can confirm or if you know based on this information? Thanks so much!