Two Times Can't be a Coincidence...Dart not Firing

Went out driving today. Increased my idle speed and richened my mixture and tested it out around the neighborhood. Seems to work...idle went down but not stuttering or stalling. Great! Warmed it up with some cruising and riding for an hour. Fully warmed up, stopped for some lunch. Got it to go and came back. Car would not start. I checked under the hood. I have a plastic in line fuel filter and its bone dry! I looked down the throat of the carb. Its still getting fuel, but it hisses and comes back up as vapor. Has to be vapor lock? So I'll wait for a half an hour before trying again.


Edit: 40 minutes later. No start with or without pumping. Fuel filter full of fuel. This is getting ridiculous! I'm gonna have to walk home!

EDIT II: Some guy came over asking if I needed help. He wiggled my battery terminals then hopped into the drivers seat. Mind you, I haven't started the damn thing in over an hour....first few cranks, it fires right up. He told me he lifted up on the shifter lever while cranking, told me it's how he's started some cars. I was able to drive home. The second I turn it off though and try to turn it back on, it won't. I try pushing up like he did, nothing. Tried putting it in neutral. Nope. I locked the car after that. This is my one and only car and my daily driver, and I just cannot keep having this happen to me. But I don't know where to look now!