I recently bought Cultus VXR 2007 model. It was running perfect on CNG, after a week i run it on Petrol, previous owner was not used it on petrol from last 4 or 5 months. Although its running very good on petrol but it takes time to start, and when it starts its vibrate, but after running 0.5 KM it becomes normal. Now when i am trying to run it back on CNG, its not running, means it become convert on CNG but vibrate heavely, Today i run it on CNG after filling CNG full, but on 1st and 2nd gear, shadeed jhatkey maar rahi ti. but in third gear it was running fine, but after running few KMs i convert it back on petrol due to strokes.
Remember on monday i changed its fuel pump.
Please tell me the solution.