Disconnect the fuel line at the carb and run it to a container. Then get
a one gallon can with some good gas, set it up on the roof of the van ,
put a hose in it and start a siphon and quickly hook it to the carb.
Start it and let it pump the tank dry. I had to do that when I put gas
in my Diesel, except of course it was the injection pump instead of
carb. Larry