97 Geo Metro won't start

My Geo starts up fine when the engine is cold. It runs fine after it starts. However it won't restart when the engine is warm. I have to wait at least 20 minutes for the engine to cool off before it will start again. The engine turns over, starter works fine, but the car doesn't start.
The injector pattern looks good.
Diagnostic tool shows no error codes.
I have already replaced these parts.
sparck plugs/wire
distributor cap and rotor
fuel injector solenoid
PCV valve
fuel filter
and cleaned the EGR.
Any help would be appreciated.

When it won't start, does it still get spark? I've had that problem on a GM IronDuke and it was a cracked coil. What happened was when it warmed up the crack got larger and the spark went out. When it cooled, the crack closed enough to conduct spark.

Hope this helps, good luck!
Merry Christmas

Thanks for the suggestion. Now I have something to look for. I was going to check it after getting home this afternoon while the engine was hot, but it started up just fine. It isn't consistent. I will check is as soon as it won't start up again.

Glad to help out, let me know.

The car wouldn't start several times yesterday. We checked for spark and it looked fine.
We think it might be a fuel pump problem. Is there a way we could tell for sure if its the fuel pump?
Thanks

I'm not sure if there is a fitting on the fuel line to hook up a pressure gauge. That would be the best way to check. Or you could crank it and right away pull out a plug and see if its gas soaked as a general check..