Fuel System; Fuel Tank Removal; Installation; Primer Pump Properuse - Toro TC 1000 Service Manual

SECTION 2 FUEL SYSTEM
FUEL TANK
Fuel Tank Removal
1. Remove the primer fuel line by slipping the
retainer ring off the tank fitting. Pull the
primer fuel line off.
2. Remove the two screws fastening the tank to
the crankcase and remove the tank
NOTE: Be careful not to lose the brass inserts
that fit in the tank mounting holes.
Fuel Tank Installation
1. Position the fuel tank on the crankcase and
fasten using the original two machine
screws.
NOTE: The ignition kill wire should be con-
nected to the tank mounting screws closest
to the fuel cap.
2. Slide the retaining ring onto the primer fuel
line, then push the line onto the tank fitting
near the primer bulb. Slide the retainer ring
down, over the fitting to secure the line.
PRIMER PUMP
Primer Pump Proper Use
Proper operation of the primer system is as
follows: See Fig. 36.
CHOKE LEVER
TICKLER BUTTON
OVERFLOW TUBE
Figure 36
19
Push the tickler button fully inward.
Manually pump the primer pump until a
small amount of fuel is emitted from the
overflow tube.
Stop pumping the primer pump and re-
lease the tickler valve. The engine is now
ready to start.
Primer Pump Operation
The primer system on the TC1000 is used on
cold starts only and ensures that fuel is present
throughout the entire fuel system. It relies on
manual pumping action to draw fuel into the
primer and to pump it into the fuel line and the
carburetor.
The primer pump uses a two step operation to
pump fuel to the carburetor: Pushing on the
primer diaphragm does the following: See
Fig. 37.
INLET CHECK BALL
OUTLET CHECK BALL
VALVE CUSHION
Figure 37
1. The inlet check ball seats.
2. The outlet valve is pushed against the porous
valve cushion to allow fuel or air (whatever is
in the primer diaphragm) to pass into the fuel
line and carburetor.
Releasing the primer diaphragm allows it to
come back to its original shape which results in
the following: See Fig. 38.
FUEL FLOW
\
VALVE CUSHION
I
\
VALVE CUSHION
CHECK BALL
I
OUTLET
INLET CHECK BALL
Figure 38