Originally Posted by
Seat13F_AC_CRJ
IIRC, there is a gas station at the airport, but it may be on the exit side of the roadway. Have a close look when you are departing YUL for downtown.
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13F
Unfortunately, the PetroCan on the airport property closed. There is a small Esso just off the Cote-de-Liesse not far from the airport (had to get windshield wiper fluid there last night - it's full service and tucked away a bit) and another station next to the 20 (but that requires making it through the Dorval circle - a fun part of a tour of Montreal!).