I was going to do this test, but couldn't find which line to disconnect. The fuel distribution appears to come in on the right side of the engine via an insulated copper (?) pipe, right? Then it's connected to a short bit of flex, into some sort of controller (is that a throttle body?) and then back...

11 litres (about 4 US gallons) of some sort of oil/gas mix were put into the tank of a 2008 Vibe. The car ran for a short time, but will no longer start.My guess is a plugged fuel filter? Any other things to check?Maury