Chevrolet Beat comes with only petrol engine option. All three variants of Chevrolet Beat are equipped with the 1.2L, 1199cc, 16-Valve DOHC, STEC II petrol engine with five speed manual transmission gearbox. This petrol engine with Port Deactivation Technology reduces the noise and enhances the fuel efficiency and enables the Chevrolet Beat to offer mileage 14.5kmpl in city and 18.6kmpl on highway with A/c and not A/c. because it does not effects more of mileage
For a detailed information about the car please visit the given link as above.
Please check following things
1. Is Fuel pump noisy. If yes change the fuel pump motor. Its cheaper than replacing whole fuel pump.
Swift Diesel Fuel pump motor is compatible
2. Check Battery voltage at Glow plug point it should be minimum 10.5V. If not change battery
3. Last option is check fuel injector leakage and get it callibrated
It is advisable to start a car once in a week or two and take it for a spin if possible, so the battery get recharged. Also, if you are planning to park it for a longer period, we will advise you to get jack stands and also to disconnect battery terminals, then you won't need to start it again and again.
What we can understand from your question is that, your tachometer is not coming up and the car is not starting. It could be because of a dead battery, we will recommend you to jump start your car if you don't have jumper cables and a good battery, you should it take it to the nearest service center. Other problem can be related to the start relay or electricals of the car.