I appreciate your answer however i am looking for more specifics before i make my decision. Id like to know exactly why they are causing the backfire. There are two pumps, several feet of hoses and even a few electronic valves. It is a rats nest of junk stuffed into an already tight location afforded by the van body. I would not mind fixing it if it will be a simple parts replacement, however if i would need to redo all the dry rotted hoses and / or chase down electrical demons id rather get rid of the whole mess. Not only would that be cheaper but make working on the engine in the future exponentially easier. It should be noted that i live in a non-emissions state and doing so would not be a crime.
Hello, as i had not received a response from you i cheated and asked the question again this time on the US Ford section. I do not know if i screwed up and asked this in the UK Ford section or after awhile of no one responding the site may have kicked me over to the UK side? Either way thanks for your answer it was just not as detailed as i needed.
PS did Europe require these overly complicated and easily malfunctioning air pump systems as well? I had assumed it was only the US that suffered through this nonsense.