i have a code on my 2003 chrysler pt cruiser,ansd its P0688, now what is the Auto shutdown for and why

Next time it refuses to start don't wait look for fuel and spark-also go to this link: https://www.2carpros.com/articles/car-cranks-but-wont-start

does it turn over but just not start? do you hear pump run? have you tried giving it some gas pedal(dont pump it)?

i just put in brand new plugs like 2 months ago, and when it would not start i did push the fule injector test port and fule did come out of it. it will start after about 15 minutes, but if i i turn it off then try to leave asap it wont start. i also do hear my fule pump kick on as well.

Check the fuel pressure if its within specs with a gauge to confirm the actual fuel pressure-start here

the fuel port sorry about that

yes i have also done that and its at 70 psi

The fuel pressure is excessive-should be 53-63psi-check the fuel pressure again with and w/o the fuel pressure regulator