Went to move the SMTAD out of storage after it's sat for 1 1/2 years. It started right up on gas, but would not switch over to diesel. I bleed the water trap, and both filters, but am not getting any fuel out of the bleeders at the injectors. No white smoke when I advance the throttle when running on gas. She ran good when I last drove it. I also checked the oil level in the pump, and it looks like there is some diesel getting the oil. Looks like I will have to bite the bullet and take it off and take it apart or get it rebuilt. Sooooo, I'm looking for manuals on ebay and there are three different parts books that look like they might be helpful. At the top on each there is a PU number. They are PU-40, PU-27 and PU-27A. Does anyone know which is the correct one for the SMTAD injector pump? Also is there a blue ribbon manual on repairing this pump? can't find one on ebay at this time. Thanks for the help!