Yeah great ****ing idea...
Without even contemplating the install of the tank etc..
If he hasn't fitted LPG signs to the plates it's DANGEROUS to ERT should the vehicle be involved in an MVI.
Or if the button is bumped and floods to intake turning it into a grenade...
Or in an impact the button is bumped and starts pumping gas into a smashed vehicle...
There is a reason certified systems are certified - they have safety factors included to ensure they shut down should something go wrong... controllers, solenoid at both ends, relief valves, etc etc...
This isn't trying to do something different..
This is dangerous and dodgy bloody work...

