1994 C10 -
Starts quickly when engine is cold- sometimes wont start at all when
warmed up.
It runs fine, gets good mpg, but it it runs very long, and try to restart
- it will NOT start.
Cranks - but doesnt run.

I am going to check fuel pressure, and spark;
but anyone experience this, and have suggestions to narrow-down repairs
needed?

The check engine light is NOT on.

Battery voltage is good,
alternator charging.