[Bounced2X]

The opposite happened to me once, gas to diesel.
Had a rental tractor (semi) once and when I got to my initial destination, about 20-30 miles, and the motor started to "runaway". Got the rental company to send a mechanic to check it. Turned out whoever fueled it on it's last return filled one saddle tank with diesel and the other with gas. I drove it far enough for the gas to cross feed enough to the engine. We had to tow it to a place to drain the gas, about 200 gallons, replace all the fuel filters to it get back on the road again.

[T-Bird45]

The way it happened to me was the bulk truck put diesel into the unleaded underground storage tank. The bulk truck was there when I was doing my fueling. The station caught the error just as I was leaving & had a tow truck take my vehicle to a mechanic for draining the contaminated fuel. My vehicle was just one of many that had to be repaired on the bulk truck company dime.