As far as I understand, `man_made=fuel_pump` are the "normal" pumps we have in Latvia in "full" fuel stations (even though you can pay directly at the pump). We have few mapped because it's tedious micromapping. Meanwhile `vending=fuel` are not at an actual fuel station, but individual directly-unsupervised self-service locations like near a shop or something. I don't think we have those in Latvia anywhere. I think the only ones we have mapped are errors due to iD preset being wrong before - https://github.com/openstreetmap/id-tagging-schema/pull/988. I've corrected the obvious ones, which was pretty much all of them.