Six injectors, Huei pump and labor $ estimate?

I would first make sure your fuel filters have been checked .Rv sitting around most of time are possible to have developed bacteria in there fuel tank an that will plug filters an cause problem you have.I find it hard to believe mechanic has decided you need all 6 injectors replaced??? How did he decide on that?I WOULD DISCUSS your problem with someone you might know who is knowelagelable on diesel engines.But if filters have not been checked insist on it first!!!