If you need a vaccum diagram for 1991 B2200, email me at photocycle@yahoo.com and I will email you a .pdf file. I got it from the local dealer and scanned it. Please note: I don't check my email daily nor do I check this forum. So it may be a day or three before I send it to you and please don't request one by responding to this post. It may be a month before I read it.

Enjoy your truck!