If thats correct, imo, pin hole leak on fuel line, lower needle closed, fuel tank lid or seal, or old nitro fuel which wont explain dry internals.
I'm not sure if an air leak on the motor would effect draw much, I'm assumimg not.
Seems like you got a gremlin, I would seperate this car so it...
My guess is the fuel line or fuel tank. I've heard on traxxas trucks of new parts not working, but this was years ago. I usually blow in the exhaust line into tank to prime.
Since you mentioned new carb, I'm assuming its not gummed up.
After you try starting, pull the plug and see if its wet or dry.