My crx won't start when it is hot outside. I know this is crazy but when it has sat a while, and it's hot outside, it will not start. I walk away for a few hours and zoom, first turn. My son told me this when he had it at UofAz during the summer. I drove out there and same thing for me. Any ideas would help. Could it be the fuel filter? It has never been changed, I don't even know where it is.

 

You are describing the classic symptom of a bad Main Relay. The solder cracks on the connections over time and causes problems when its hot. You can take it out and pop the cover off to resolder any cracks on the board.

 

Here is a great write-up with pictures on how to repair a bad main relay.

http://www.tegger.com/hondafaq/mainrelay.html

Hope this helps.