I have an unchipped debit card and it works at all the pay at the pump stations in Yukon. At some gas stations you have to go inside to pay, regardless.
A couple of stations have the tap'n'go payment at the pump but the pumps still take the good old unchipped card too.
In B.C., it is law that payment must be made before pumping. So the pay at the pump is popular but some stations are still old-fashioned and you'll need to leave cash or credit card with the cashier before they activate the pump. Although Toad River on the Alaska Highway still lets folks pump fuel without pre-paying. Also, our last time through Toad River the internet service was down so they were taking cash only, no cards of any type.
Always have enough cash to buy a tank of fuel. It isn't uncommon for the machines to go down for a few hours or a day or two here.