Are you running stock pump still ??
Surge tanks are insurance policy ,not just when tank is near empty but at any stage. By the looks of it you like having fun in the stag, I'd be checking filters including sock filter on pump and while you got it out change the pump to a deutchwerks Intank or walbro and give it a direct battery feed so 12v+ switched of course ,and if ya looking to mod in the future chuck a surge and external pump on when ya do