Re: the footage
I agree that he could have gone in because the first pump was faulty, then pulled forward and paid at pump #2. But, I think it's the pattern of mask wearing and headlights that is throwing me off for that scenario.
As presented to us, the detective is suggesting he pumped his gas, put his mask on and entered the store briefly, returned to the car, then departed. The edited footage has him outside his vehicle at pump #2 without a mask and headlights on. We do not see him take the mask off or use the second pump.
For him to be at pump #2 with headlights on and NO mask, then he had to have turned the car back on and gotten out of the vehicle, taking off his mask sometime during that process.
From my observation (at least here in CA), most people take their masks off inside their vehicle. I'm thinking it could be a possibility that he started to drive away, then realized his mask was still on, so got out and put it in his bag, possibly in the backseat or trunk?
Now the above scenario would work with both moving to pump #2 or staying at pump #1. What's in favor of staying at pump #1 is that he would have had to use his card before attempting to gas up. There's only one purchase, no? If he had gone to pump #2, his card would show an authorization attempt and incomplete purchase on pump #1, then a successful transaction on pump #2.
So if nothing was wrong with the pump, why put on a mask and go in the store for 15 seconds? The best I can offer (from personal life experience) is that maybe he tried to go to the restroom, found it locked, and returned to his vehicle. Small bladders are a curse.
EDIT: I also can't find him on video in the position next to the car that is shown in the thumbnail image of the Fox clip posted here. Can anyone give a time stamp? This is where he is to the left of the vehicle, but at pump #2.