It's interesting that you mention water being one of the ingredients in seafoam. I do remember reading about steam or water injection and it's cleaning properties although I'm not brave enough to try that just yet!
I must also point out that in a diesel engine there is a vacumn pump providing the vacumn to the brakes. This has no connection to the engine intake so would not be any use as an engine cleaner dosing line. Which is a pity really.
However in a gasoline car it would be perfect for long term cleaning and not just in the driveway with the hood up!
ollie
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