Show distillation points I 1 distillation range tests provide an indication of the volatility of a gasoline volatility should be such that the engine will start easily warm up quickly accelerate satisfactorily operate without crankcase dilu 1 i tion and be free from vapor lock the 10 per cent point in the distillation til lation test is the point at which the temperature shown has evaporated 10 per cent of the gasoline this point is used in determining the ease of starting the engine low temperatures at this point indicate quick starting this 10 per cent point is also used together with the vapor pressure to estimate the tendency to vapor lock A low temperature combined with a high vapor pressure may cause vapor lock particularly in i warm wc weather ather |