FUEL FRESHNESS AND TROUBLESHOOTING 

Engine performance is directly related to the quality and freshness of the petrol consumed. Therefore, it is important to be sure the fuel within the engines you are servicing is usable for your testing procedures. You may save valuable troubleshooting time by replacing fuel if its quality or age is in doubt. Detonation (or pinging) on acceleration is an indication that the fuel is either not of good quality or is too low in octane rating for your application. Fuel should be no more than six to eight weeks old.

NOTE • Unleaded petrol has a shelf life of about 3 months