i put unleaded in my diesel engine?

this depends on engine make and model. In general:
- disconnect fuel hose from tank to engine
- let unleaded fuel out of tank (collect it and bring it to waste disposal, or burn it in another car, depending on the diesel/unleaded mixture)
- replace all fuel filters
- reconnect fuel hose
- de-air fuel lines
- try and start your engine multiple times

FaalHaas
June 2010