PURPOSE: To prevent occurrence of vapor-lock, by driving a fuel pump driving motor intermittently for a prescribed while when the fuel temperature is raised at the time when an engine is not in operation.

CONSTITUTION: When the fuel temperature (t) is raised along a characteristic curve A after the time (m0) when operation of an engine is stopped and reaches a set temperature (te), a timer circuit T is set into operation at a time (m1) and a transistor Tr1 is energized. Resultantly, an intermittent driving circuit IN is set into operation and a transistor Tr2 is energized intermittently, which causes intermittent opening and closing of a contact (a2) of a relay RL2, so that a fuel pump driving motor M is operated intermittently. Thus, since the fuel temperature is lowered rapidly as shown by a characteristic curve B, it is enabled to prevent occurrence of vapor-lock.