gases are routed to the intake manifold in addition valves 72 and 73 are set to the open position so that heated fresh air is routed through pcv canister 76 in an alternative embodiment the pcv canister can be purged by setting valve 71 such that crankcase gases can flow from crankcase 41 to pcv canister 76 while valve 72 is open valve 73 is not required if pcv purging is performed using crankcase gases when fuels comprised of a predetermined mixture range of alcohol and gasoline are in the crankcase e g fuels between 49 and 80 gasoline the pcv canister is filled and purged such that hydrocarbons liberated from the crankcase are advantageously combusted by the engine in one embodiment pcv canister valves are operated so that crankcase hydrocarbons are stored in the pcv canister from engine crank until vertical marker 301 is reached hydrocarbons stored in the pcv canister are then purged to the engine intake system from vertical 301 until vertical marker 303 at vertical marker 303 hydrocarbons are stored again in this embodiment vertical marker 303 corresponds to a predetermined temperature of the engine and the predetermined temperature of the engine is related to the boiling point of a single boiling point fuel e g ethanol crankcase hydrocarbons are stored to the pcv canister when the engine reaches the predetermined temperature that is related to the boiling point of the single boiling point fuel in this embodiment vertical marker 305 also indicates two conditions a low engine load condition and a second predetermined engine temperature if.