Outer Limits 4x4 Board

Im going to replace the carby on my 22r hilux thats on lpg question is will the new carby need to be tuned to the lpg or is the lpg separate to the gas and not need tuning? the repacement carby will be second hand and is got to be better than the one on the car
any help would be great

Cheers Adam

your gas is completely seperate so it will not need retuning as long as it runs okay now