Dan has an after market safari tank on his WR and purchased said tank from e bay. I have both safari and clark aftermarket tanks and would recommend either brand.
Was it an hot day there, you should do better then that and it sounds like it was a one of because you haven’t mentioned it here before maybe?
Was it flat smooth easy going when you switched onto reserve? I ask this because being like that you may have still had a wack of fuel on the other side of you tank you would normally use (the rougher riding throws the fuel over the spine to the pick up) I have had this happen to me on transport sections where I have had to go onto reserve but have been able to go back to the on postion when got back in the singles if that makes sense
TB