Engine Problems Help!!

Well i have been working on my car for awhile now And i just installed my megan racing header and took out my AC. so now whenever i drive around and turn my caroff and try to start it up it dosen’t. i have to wait a couple minutes to start it. does anyone know why it does that?

http://www.g2ic.com/forums/announcement.php?f=29&a=13

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SEARCH. this has been discussed before. main fuel relay.