hl replied:

You will find that the injection is done into the inlet manifold, not directly into the combustion chamber. Therefore the same problems could still happen.
Cheers

Andrew-rodeo replied:

YES, having lpg injection avoids all problems associated with lpg in the past. You no longer have an inlet manifold full of lpg vapour, the injector is located as close as possible the the petrol injector and only injects the lpg vapour as required. The lpg computer is linked the the factory ecu and emulates the petrol injection.

Dallas from Team Green Autogas replied:

G'day Pathfinder,
Andrew is spot on mate. The problem in the past has been that you have an inlet manifold full of lpg so if you get a crossfire from your ignition system then you ignite the entire manifold wurth of lpg resulting in backfires, blowing the airbox & airflow/mass meters to pieces.

With the new vapour injection system you have brass fittings fitted into the inlet manifold as close to the inlet valve as possible so you don't have a complete manifold full of fuel. This means there's not as much opportunity for a backfire as such. The worst that you'll get is a stutter / miss as you would get on petrol.

The vapour injection system will give you better efficiency than the standard venturi system so over the long run it would be the better investment but just remember that you'll really need to do more K's before you reach your payback point.

Regards
Dallas Green