I have a 95 del sol with a d16z6 1.6 4 cylinder v-tech, and now it takes a while for it to prime (especially on hot days or whenever it rains.) I've pretty much replaced the ecu, main fuel relay, fuel pump, starter and distributor. At this point I feel like taking it to Honda so they can check it out. Any help would be greatly appreciated!!

 

My ideas after you've done those things, would be ignition switch? Fuel filter? I just don't know why it would be worse on hot days or rainy days though. They would effect the switch possibly, but not the filter. Also check for a clogged Vtec cylanoid. Maybe even a bad temp sensor. That's my only ideas.

 

As go250mph says, fuel filter is point one to look at if you haven't gone there yet.
After that, I start by tearing things apart and testing them one by one. the pathway is my first place to look, can the fuel lines flow easily?