One of the other franchises in our area had an incident recently where an employee accidentally added 5 gallons of regular gasoline in their diesel trucks. They were advised by their mechanic to keep it full of diesel for a while and it should dilute the gasoline. Didn't sound exactly that easy to me, but wanted to get someone elses opinion. This is exactly why we lock out the regular gas on our key pump system. The keys on the truck rings only allow the guys access to the diesel.