The car in question belongs to a friend. 100K Km on the clock with CNG, mostly driven on CNG. It does not start easily after being stalled for 1-2 hours. Need to manually switch to CNG and Petrol alternatively and giving long self start tries, and it eventually starts. Runs fine on Petrol and CNG otherwise.
Another option to start is by putting a few drops of petrol in the opening of pipe leading from Valve cover to the air filter (marked in the picture). PS. The picture is not of the car in question, but a randomly picked picture from the internet.
Once hot, the car starts fine, but cold starts are the basic problem.
Toyota 3S mechanics first advised replacement of injectors. When argued that in case of bad injectors, the car should demonstrate missing while driving as well. Then they advised replacement of fuel pump. This shook our confidence and we decided to call for experts' help on this forum.
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