Any real vehicle thieves can work around it quickly,.
How do they do that?
They can be intermittent, it's an electrical component after all! If you take a rubber mallet and give the middle of the tank a couple good smacks, and it wants to work right, good chance it's the fuel pump. Or at least a loose connection in it or the adjacent harness.
Today, no fuel pressure.
Thing is though, I was looking through some invoices that came with the truck and there's one for a fuel tank module (£127, circa $150 - is that a pump?), Locking Ring, and filter dated June 2018 and another for a fuel tank strap one month later. And another fuel filter in March 2019.
If that's a pump and it's been changed that recently - what would make it so intermittent in operation? The wiring to it running rearwards or something in the PCM?
This looks less like PL as I'm not even getting the usual 2 seconds of start up.
I need to try and 'force' the pump via the relay connection and if I can get it to work consistently by-pass the PCM with either a manual switch on the dash or by taking a signal from the LPG system that instructs the gasoline injectors to stop working when switched to LPG. That way, surely the only thing that can stop it running is if PL gets to the injectors first.
Going slightly leftfield... the bulletin re remote start only mentions 'disabling' the injectors. Doesn't explicitly state whether by depriving them of electrical signal or fuel.
A two second delay while the PL module decides it's a theft attempt and denies injectors of their opening signal is a bit tardy for an electronic system that should be able to react in millie seconds. On turn of the key before cranking - the prime from the pump would surely be enough for it to run for two seconds even if PL kicked in the moment the key was turned to crank. And, the one other safety system I'm aware of (in the event of roll over) stops the pump.