The pull ahead is only for when completely done with your transaction.
Now, if you need to go in and use the restroom, get some coffee, and buy snacks for 5 indecisive people, finish up at the pump, then find a parking
space and use the convenience store.
More than once, mostly when travelling, we have come up behind an empty and unhooked car, just waiting...until the owner comes out with arms loaded with food and drinks. And then they wipe the windows with that cleaner and blade thing, or they re-fold a blanket, or change drivers and key chains, or open and serve the food...all while sitting at the pump space, yet not a drop of gas is going in.
So, ask the attendant who takes your card.
At a completely self serve, do the gas thing at the pump, then park and do the store thing after you have parked.
I realize that was more than your question asked, forgive me?