my 2001 GMC Savana 1500 engine crank but won't start

Check fuel pump relay and fuse to start with.

check fuel pressure. if you dont have a way of doing that, have someone turn the key ON while you listen down the gas tank for a 2-4 second buzz noise, if you hear that, your fuel pump is working. if not, it could just be really quiet or it may be bad. hit the bottom of the tank and sometimes it'll start working. If you hear that buzz, or you checked and it had fuel pressure (should be about 50 psi), check for spark, if no spark, you probably have a bad crankshaft position sensor or something bad in the distributor