I took some time today to put together the information covering the different fuel delivery systems and how they work on the P-30 Series Chassis. There are always some variables due to supplier and run changes. So it is good to have the Vin number when you find things that are a little different, when working on the systems. It is a little long and did not cover carburetor information. They are a subject in themselves. Rich. Edited 2-8-2013 Vapor lock problems added at the end of article. GM