bought this to fix fuel drain back problem

well, here is an UPDATE on the fuel drain back problem.I brought this car home last week from the car show. it was hot. engine was hot. car has set for days now. I got in it today to get ready for a cruise in tonight and I pumped it twice and it fired right up. It didn't even idle irratic like it used to when it seemed like it was not primed. so, as far as I am concerned guys, it works for me. for about $9.00 shipped to my door I have considered this problem solved to this point. I don't know much how to include links on a computer but I bought it on ebay. the item # is:360517597852.The company is from the UK and their name is car parts international. They are really fast when it comes to shipping too. I am satisfied with it. I do want to thank you guys for all the ideas you mentioned but in this case, it wasn't evaporation. it must have been drainback.