
The precautions for transferring ownership of a used CNG vehicle's gas refueling certificate involve transferring both the gas cylinder and the vehicle together. Below are the detailed steps and considerations: Main steps are as follows: Drive the vehicle to the local Special Inspection Department for gas cylinder transfer, which is usually located within the Administration for Industry and Commerce. Note that the vehicle must meet the original technical parameters; otherwise, the transfer cannot be recorded. Then, both the buyer and seller should go to the Vehicle Management Office together. After filling out the contract, they can proceed to the counter to complete the transfer acceptance procedures. The traffic police will guide you to drive the vehicle to the inspection area, where they will conduct a technical inspection, take photos, and perform engine tracing. Finally, the traffic police will provide the photos to the applicant, who needs to paste them on the record form and then drive the vehicle to the designated parking area as instructed. Both parties should return to the transfer hall and submit the required documents to the staff. After the transfer, bring the files back to the Vehicle Management Office where the vehicle is registered and schedule an appointment for the license plate registration. Precautions for gas refueling certificate transfer: If the vehicle has been modified from gasoline to CNG and registered with the Vehicle Management Office, there is no need for a separate gas cylinder transfer procedure. The gas cylinder will be transferred along with the vehicle. If the vehicle has not been registered with the Vehicle Management Office, you can choose to transfer the gas cylinder at the Special Inspection Department or remove the gas tank and restore the vehicle to its original condition, which also allows you to complete the transfer procedures at the Vehicle Management Office.

I specifically asked about this before buying a used car. The transfer of CNG vehicles isn't that complicated, but you need to be a bit careful. The main thing is to make sure all the documents related to the gas refueling book are complete, such as the vehicle's compressed natural gas device inspection certificate and pressure vessel certificate—these are all recorded at the DMV. Both the buyer and seller need to go together to complete the transfer with their IDs and the vehicle registration certificate, and they must present the original and a copy of the gas refueling book to confirm that the tank inspections haven’t expired. Otherwise, the transfer could get stuck, which would be a hassle. Additionally, it’s advisable to have a professional CNG repair shop conduct a safety check first to inspect the sealing of the connectors—older parts can easily become hazards and affect driving safety. To save trouble, you can hire an agent to handle the paperwork for you; it might cost a few hundred extra but saves time and stress. Remember, don’t go for a cheap deal on a problematic car, or you might end up unable to refuel at gas stations after the transfer—that would be a real headache.

When I helped someone repair a CNG vehicle before, I found that the gas refill book was a focal point during the ownership transfer, and the cylinder certification must be on hand. Under normal circumstances, the simple steps are: when submitting the vehicle registration documents to the DMV, bring the original gas refill book to verify the inspection period—usually, the inspection report is valid within three years. Inspection points include checking for valve leaks, cylinder damage, and other details. It's advisable to use soapy water to check the sealing ports for bubbles before the transfer to ensure no hidden dangers. If the book is lost, immediately go to the original inspection agency to reissue it—don’t delay, as it could affect the transaction. The cost is low, just a few dozen yuan for processing fees, but safety comes first, so inspection is mandatory. Common issues like loose or aging cylinders can easily cause the transfer to fail—I’ve seen buyers overlook this and waste a trip. A reminder: when refilling gas, always keep in mind the pressure limits and maintain cleanliness.

Last time I bought a used CNG car, the transfer process was quite a hassle. The key with the gas refill book is to check if the cylinder inspection label is valid—just make sure the date stamped on the cylinder isn't confusing. Both buyer and seller need to bring their IDs, queue at the registration office, fill out forms, and submit a copy of the book to get it done. The whole process can be finished in half a day, but be sure to go to an official station and don’t trust verbal agreements. I recommend test-driving before the transfer to check if the refueling function works smoothly and the valves operate properly—anything that affects daily use. To save money, a DIY check for rust on the cylinder connectors is enough, quick and easy. If the cylinder is old, spending a little to replace it can save future headaches. The gas refill book might seem minor, but don’t cut corners to avoid fines or being denied refills. I once had a cylinder leak after the transfer, and it cost me big—lesson learned.


