Ingersoll Rand model 7/41 Compressor wil not start on it's own
I have an Ingersoll Rand Compressor model 7/41.
The compressor has had a full service ie all fuel, oil and air filter's were replaced, and the fuel system bleed of all air in the system.
The problem is it will crank over normally but will not fire up. It will fire up almost immiediatlly if you put a petrol soaked rag by the air filter inlet, it will fire up and run normally.
After running and working under load you can then switch it off, but if you try to start it say after 5 minuets it will not fire up unless you repeat the petrol soaked rag routine, and then it will run and work the whole day no problem.
What can be the problem? by The way I have another compressor same model with exactly the same problem, what give's