Many new car owners who buy a CNG vehicle often ask one basic question - should petrol and CNG be kept in equal amounts? The short answer is no. You don’t need a strict 50:50 balance. But ignoring petrol completely can quietly damage your car over time. In cars like the Maruti Suzuki CNG cars or any modern bi-fuel vehicle, petrol still plays a very important role even if you mostly drive on CNG.
Why Petrol Still Matters
A CNG car is not designed to run only on gas all the time. Even when you are driving on CNG, some petrol system parts are still working in the background. One of the most important parts is the fuel pump. This pump needs petrol to stay cool and lubricated. If the petrol tank is almost empty, the pump can overheat and fail. Replacing
it is not cheap. Similarly, petrol injectors also need occasional use. If they stay unused for too long, they can get clogged. This leads to rough running or starting problems later.
Cold Start And Engine Health
Most CNG cars actually start on petrol first. This helps the engine warm up properly before switching to gas. This small step protects the engine from wear and tear. CNG is known as a “dry fuel,” which means it does not provide the same lubrication as petrol. Petrol helps protect engine valves and internal parts. If you avoid petrol completely, parts like valves and gaskets can wear out faster.
The good news is that maintaining your car properly is very simple. You don’t need equal fuel levels, but you should always keep at least 25% petrol in the tank. This ensures the fuel pump stays submerged and cool. Experts also suggest driving your car on petrol for about 10-15 km every week. This keeps the injectors clean and the system healthy. Another practical tip - always keep some petrol as backup. CNG stations can sometimes have long queues or may run out. Petrol can save you from getting stuck on the road.
Also Read: Maruti Suzuki Fronx Delta CNG - Price, Mileage, Running Cost And More
What Happens If You Ignore Petrol?
If you run your car only on CNG for long periods, you may face issues like fuel pump failure, clogged injectors, damaged seals, and even engine problems. These repairs can cost much more than the fuel you save. CNG cars are excellent for saving money on fuel. But petrol is not optional, as it is part of the system. You don’t need a 50:50 balance, but you do need a smart balance. A little petrol in the tank can go a long way in keeping your car reliable, smooth, and trouble-free for years.
