I want to convert a Toyota pickup to run on CNG. While I used to be a Peterbilt mechanic, I think that safety and reliability dictate that I leave any conversion to a shop that does these regularly. I am a proponent of following the law in every way and have no interest in an illegal system.
My question is this: Let's say I go to a shop and have them add a system such as a Prins or a Tomasetto along with a shiny new Lincoln tank with a 20-year life and approved piping to something like a 2008 Toyota Tundra truck that has something like 30,000 miles. Let's say that in choosing a shop, I exercise good judgment, look for experience, and avoid like the plague anyone who even remotely suggests adding an "emulator" or otherwise doing anything other than leaving intact my existing OBD II computer and monitoring devices. I would register the truck in Utah and drive it there with the possible exception of a few vacations. Of course I would have any needed safety inspections and emission tests at the intervals required by the state in which I register the truck. I have no interest in living in California and foresee no reason to register a truck there.
Is this breaking the law? My understanding of the law is that with either criminal prosecution or civil penalties, something is legal unless there is a statute, code, or regulation that makes it illegal. Things can't be illegal "just because." For that reason, if this is illegal, I would be appreciative of a response such as, "This is illegal because [insert statute, code, or regulation cite here] says [insert what it says] and your proposed conversion would [insert how it violates the language of whatever statute, code, or regulation it would violate]."
I'm grateful for any thoughts that will let me convert a truck and start buying fuel from people who don't shoot at Americans; I will also be grateful for thoughts that keep me from running afoul of the law.