Ok, What was the final repair.
started out cranks but does not start. have fuel. have a code E-27. I cleared the code with a OBD hand set as soon as you crank the engine the code came back. I unpluged both sensor plug, to see if just dirty connection and if any broken wires. did not find any broken wires. I checked all the fuses and tested all the relays all ok. I replaced the Crank and cam sensor as a brand set. I think they are Startlift parts. The code 27 went away. still crank but no start. I found this time I was not getting any fuel from the LPG tank. Customer had turned the tank off from the day before. Something went wrong with the valve. changed tanks it was very low, engine then starts and dies. Installed a full tank and still have the same trouble. starts then dies even if you hold the key in the start position it will start die start die. and no codes. I checked all the filter all clean. I have fuel to the mixer. and i can hear the throttle valve cycle whenever the key is cycled on and off. and the injector seem to be operating. If I was getting a low fuel pressure problem it would show a code. I cranked the battery down to **** so I had to put it on charge over the weekend will go back monday.