Description Of Operation - TOHATSU 40 Service Manual

SECTION 3

DESCRIPTION OF OPERATION

The following description of operation applies to fuel systems
equipped with the oil automixing feature. Premix fuel systems
operate in a similar manner but do not include a separate oil input
circuit.
Fuel Flow
Upon engine startup, engine oil from oil tank (1) is drawn
1
through oil filter (2) and into the oil pump. The oil output
from pump (3) is then directed to automixing check valve (4). At the
same time, vacuum pressure on the suction side of fuel pump (5)
causes raw gasoline from fuel tank (6) to be drawn through filter (7)
and into the check valve. The oil mixing check valve ensures
gasoline and oil are mixed before entering the fuel pump. The fuel
pump output is then directed to multiple carburetors (8) for proper
dispersal to the engine.
3-8
T1001
3-/ 4-Cylinder