Input on hot start failure

[onetinsoldier]

Ok If I drive for more than 30 min and I park the car , If I dont wait at least 30 min it wont start . The starter turns it , it has spark , but no start .

Now I removed a vacuum line on the plenum and spray carb clean in it , it starts , if I turn it off and try to start with no carb clean , no start by itself .

Obviously its a fuel issue , but what's causing it ? I'm wondering coolant temp sensor ? ....................