I "inherited" this Nissan mcpl02a25lv after it was returned to customer from my shop for cylinders replaced. it had a code e27. my boss sent me with both the cam and crank sensors. after replacing them and doing the pedal dance to clear the code the truck started and ran fine, until the next day. the customer called and said it wont start. went back and it would turn over and almost start then just keep turning over. I took the hose off from the regulator to the mixer and after cranking the engine the vapor turned to liquid. odd I thought and replaced the fuel tank thinking the pick up tube is broke/missing. after swapping tanks the truck started fine, until the next day again. I returned and insp no codes and with a shot of carb cleaner in the air tube to air horn the truck starts and runs fine, you turn it off and it wont start again until you hit it with another shot of carb cleaner. seems like the lpg injector doesn't get an initial fuel sense or the assistance injector, which I believe is the small one next to the fuel pressure sensor on the mixer. it seems too coincidental that after replacing cam and crank sensors for a code that popped up after replacing lift cylinders and now it wont run. just odd. am I missing something here? I am not seeing a "relearn" for the cam and crank sensors. any help is appreciated