CNG Conversion: What Drivers Should Know

A lot of drivers on Shareide run CNG-converted vehicles, and for good reason — on a day with back-to-back seat bookings, fuel is usually the single biggest cost eating into what you take home. But a CNG conversion is not something to treat casually. The cylinder sits under pressure in a car full of passengers, and a bad installation or a skipped inspection is not a risk worth taking to save a few rupees. This guide covers what to actually check, not what a shortcut mechanic will tell you to skip.

Get the conversion done at an authorized workshop

Pakistan has licensed CNG conversion workshops that follow the cylinder and kit standards set by the relevant regulatory authorities. An unlicensed garage might do the job cheaper, but you have no way of knowing if the cylinder is rated for the pressure it will actually see, or if the fittings were tightened to spec. If you're getting a new conversion or switching workshops, ask to see the workshop's registration and the certification paperwork for the cylinder itself before you commit your car to them.

• Keep the fitment certificate. A proper conversion comes with paperwork showing the cylinder's manufacture date, test date, and expiry. Keep this in the car, not just at home — traffic police and inspection points ask for it.
• Don't let anyone skip the hydro test. CNG cylinders have a mandated periodic testing cycle. A workshop that offers to "skip it this time" is not doing you a favor.
• Ask about the kit brand. Reducers, valves, and the cylinder itself vary in quality across the market. A reputable workshop will tell you plainly what's installed rather than being vague about it.

What to check yourself, regularly

Between official inspections, there's a basic routine that catches most problems before they become dangerous. Get in the habit of a quick check before you start a long driving day, especially in summer heat when pressure inside the cylinder rises.

• Smell test. If you smell gas anywhere near the trunk or under the hood after starting the car, don't drive — go straight back to the workshop.
• Check the expiry date on the cylinder. It's stamped on the cylinder itself. An expired cylinder is not legal to keep running, no matter how "fine" it seems.
• Watch for a drop in power or rough switching between petrol and CNG. This usually means the kit needs servicing, not that you should just live with it.
• Never leave the car parked in direct sun for hours with a full cylinder if you can avoid it — heat raises internal pressure.

Why this matters more when you're carrying passengers

On Shareide you're not driving an empty car — there are riders in the back seat trusting that the vehicle they booked a seat in is safe. That's a different responsibility than driving alone. A cylinder that's overdue for testing, or a kit that was installed by someone cutting corners, isn't just a risk to you. Shareide's safety features like live GPS tracking and trip sharing cover a lot of ground for riders, but they don't replace basic vehicle maintenance — that part is on the vehicle owner and driver.

Frequently asked questions

How do I know if my CNG cylinder is due for testing?

The test date is stamped on the cylinder alongside the expiry date. If you're not sure how to read it, ask your conversion workshop to check it for you — they deal with this daily and can tell you at a glance.

Is it fine to keep using the car if I notice a faint gas smell?

No. Any noticeable gas smell means you should stop driving and get the vehicle checked before starting again. It's not worth the risk to finish one more ride.

Does a CNG conversion affect my eligibility to drive on Shareide?

No — plenty of drivers on the platform run CNG vehicles. What matters is that the vehicle is roadworthy, documented, and safe, the same standard that applies to any fuel type. If you're not yet driving with us, you can become a driver and go through the vehicle checks during onboarding.