Easier than everything, and in parts.
The first thing is to make sure that the engine has the ignition well and gasoline comes, checking this only two things must be done:
1st Remove a spark plug and put it on the engine with the high -stating cable, then turn with the start to see if it gives spark or not,
2nd if you give spark, re -curl it in its place and throw a drizzle of gasoline through the admission collector, if it is made of the gas. In the monoinjector (similar to a conventional carburetor) and if it is multipunto, look for the vacuum tube of the collector to the ignition progress, and put some gasoline out there or by the gas butterfly. Then try again, if the engine makes the threat to start or if it starts and stops, the failure is of the gasoline pump, or the injection system.
At the moment these are the two easiest and faster checks you can do to rule out whether the failure is purely mechanical or caused by lack of gasoline or ignition spark.
Greetings and let me know ok?.