first time down the track advise?

I would get under there and follow that fuel line from tank to carb. It could be as simple as a "road rock", bounced and hit you fuel line, causing it to get partially crushed.
It's possible.
My money is a rubber hose that collapsed or had a tear in the inner lining causing a flapper valve aka one way valve restricting the flow. or air can't get back into the tank as fast as the fuel is being pulled out of it.
Take that gas cap off and take it for a stomp, aka full throttle blast!
One other possibility could be that the fuel is boiling(vapor lock) I had a clamp come loose on my fuel line next to my header. It cause the fuel line to get vary close to my headers. spent a lot of time trying to fix my problem before i found that problem.