I don't know where your "here" is, but here in the USA, you cannot put diesel in a vehicle's gas tank, but you can put gas in a vehicle's diesel tank. Putting gas in a diesel vehicle is very bad.
Reason: The gas nozzles dispensing unleaded gas were made smaller to prevent people from putting leaded gas into a vehicle that required unleaded gas (which would poison the catalytic converter). The diesel nozzles remained unchanged and leaded gas (with the big nozzles) went away.
Re:Null
by imoverclocked on Thursday January 14, 2021 @09:58AM
(#25777022)
Consumer diesel vehicles often have a mechanism to (try to) prevent the insertion of a gas nozzle.
Source: I had one of those “evil” Jetta’s
As imoverclocked mentioned, some vehicles (VWs mostly AFAIK) have contraptions in the filler tube to attempt to prevent filling with unleaded gas. Of course, they don't quite work (at least the retrofit ones don't), which I know because some of the diesel pumps have the unleaded size nozzle, and I've filled with those, it just takes a lot longer.
Well.. it depends on the shape
https://www.autonews.com/article/20130521/RETAIL05/130529968...
Of course if you're trying to break it, everything is possible.