2000 silverado: wont start when warm

I have a 2000 Chevy Silverado 5.3 Liter EFI engine. It starts fine when engine is cold. After engine gets to operating temp, and you shut it off, you have to crank a long time to get it started again.
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Sounds like a fuel pressure regulator. The diaphram leaks flooding the engine making it difficult to start warm. The fuel eventually evaporates and cold starts are fine.

//2000CAYukon

Yup,just changed mine.$60 bucks for that little bugger.