There's no MIL light on the dash. I don't have a forklift specific scanner but I do have an Autel Maxisys but had no codes pop up at all when scanned. Not sure if it would even pull codes, however it does have an OBD2 connector.

All relays I did not check since I don't have an electrical diagram for it that I found just yet. Fuses are all good.

The way this forklift just "died" when it was used the day prior just pointed in my mind to some sort of electrical problem.

I checked spark on all 4 ignition coils and I have spark on all of them. I replaced the ignition coils, MAF sensor, crankshaft position sensor, regulator/vaporizer, LPG solenoid (one that has the fuel filter attached to it), and the injector I changed out is this part Forklift Injector-LPG Nikki A6600-FU571.

When you do try to crank and start the forklift in the past it did start and die. Prior to when I changed out only the LPG injector I changed out the crankshaft position sensor and I got it started. After it started I kept it on for 10 seconds before killing the ignition to put everything back together. Unfortunately it did not start back up again... I changed out that crank sensor 2/3x but no luck still. I read they have metal capped ones and plastic capped ones and not sure which of the two would work better and last longer. I was able to cross reference it to the exact same nissan crankshaft position sensor from a car and got the OEM one from the dealer.

I have not just yet changed out camshaft position sensors. The one I changed out which I'm fairly certain is the CPS where I removed the fan, belts, and it was on the front timing cover area.

I just checked the fuel line disconnected and it does release a blast of raw fuel for 2-3 seconds. It does not keep shooting fuel afterwards.