Description Of Operation; 2.5 / 3.5 Fuel Flow - TOHATSU NB-1000 Service Manual

SECTION 3
1

DESCRIPTION OF OPERATION

There are two types of fuel systems, models 2.5 and 3.5 use a gravity
fed fuel system. Models 5 through 40 have a fuel pump.

2.5 / 3.5 Fuel Flow

Prior to starting, the air vent on fuel cap (1) and fuel cock (2)
1
must be opened. The difference in air pressure and gravity
force fuel from the fuel tank to the float chamber (3) through the
needle valve into the carburetor. When pull the recoil starter, air is
sucked into the carburetor from (4) and mixed with fuel and then
pulled into the crankcase.
3-8
T1103
1-/ 2-Cylinder