good morning from greece we have the same machine Mitsubishi FG25N with E23 code indication what is the problem ?
thanks

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If you turn the key on and you hear a constant hissing noise coming from the intake its most likely the main injector oring is broken or the assistant injector is stuck open. Its possible the main injector is stuck open but highly unlikely. These are the only two components that allow fuel to enter the throttle body. I highly doubt the vaporizer is the issue. Main injector is the large circular one with an in line fuse. Assistant injector looks like a long 6 sided nut with 2 black wires sticking out the back.

Is their no code showing probably the vaporizer worth checking the assist solenoid that can stick open

I am assuming the truck is using a k21 or 25 engine if so check the propane converter pressure first take out the top plug at the Nikki converter and put a pressure gauge in there and turn the key to on and see if you you are getting 5 psi it should hold steady if keeps getting higher the converter is bad l have seen as much as 8 psi any more and will blow out mixture if OK then look at o ring at main injecter some time it breaks and could cause lpg to blow out mixter if all checks out l believe the body that the main injector sits in is bad there are small valves inside that stick and cause the lpg to blow out the air cleaner must replace complete holder hope this helps