Is it possible to disconnect the LPG system? What are the steps to take out the LPG system? How to remove LPG system ?….

This is the article from the Chamber of Mechanical Engineers on how to remove the LPG System (from a vehicle):

LPG or CNG conversion in vehicles is carried out under the supervision of an expert engineer in services that have "SMM Office Registration Certificate" and "Service Place Competence Certificate". Companies authorized to perform this conversion should also take care of dismantling the vehicle’s installation.

For companies who use the individual modification process, the dismantling of LPG conversions in a company should be completed. The Periodic Inspection Stations determine the vehicle that will be used in the LPG Dismantling Project. After the determination, the license is renewed from the registration office where it is registered to the traffic and the phrase "The Vehicle Runs on LPG" is removed.

After you have the fuel system modification in your vehicle dismantled at authorized places, "Service Place Competence Certificate", "SMM Office Registration Certificate", "Engineer Authorization Certificate for Conversion of Vehicles to LPG" and the dismantling invoice, which indicates that the company performing the dismantling is authorized, by applying to the companies authorized to draw the AITM project. You will need to draw.

You can request the traffic registration office for the inspection documents included in the annexe of the project. Your vehicle will be subject to a periodic inspection station detection inspection.