my car is having difficulty in pressurizing the fuel system. When it is cool in morning, it seems to pressurize ok, but in hot weather, it won't. Most times i sit and wait to hear it and it takes a good ten seconds...sometimes a full minute. If i try to start it before it pressurizes, obviously it won't start, and if i turn the key offnd back on, it sends a message to theft control that someone is tampering with ignition switch and shuts down the fuel system for a full ten minutes. I need to know where to begin looking for problem. I replaced the gas cap and the fuel relay switch. Now i'm leaning towards the vacuum pressure switch but i don't know where it is located. I think the fuelpump itself is alright cause it seems to deliver fuel once up and running with no sluggishness. Faulty puter chip?