Fuel Pickup Tube And Filter - Toro 51643 Service Manual

Primer Pump Reassembly (cont'd)
2 .
3.
4.
5.
6.
7.
8.
9.
10.
Valve seat "A" has a locating notch that is cut
through the seat.
Valve seat "B" has a locating notch that is
partially cut into the seat.
Gasket "A" and valve seat "A" are inside the
pump. Gasket "B" and valve seat "B" are to the
outside.
Reassemble parts into the pump body. Position
gasket B so the small fuel orifice is toward the outlet
nozzle of the pump body.
Place valve seat A with valve seats up, on gasket
B.
Push one valve cushion into valve seat A so
it
covers the double holed fuel orifice.
Place gasket A on valve seat A.
Drop the two ball valves through gasket A to seat
in valve seat A.
Place one valve cushion into valve seat B so that
it
covers the double-holed fuel orifice.
Set valve seat B with valve cushion into the pump
body with assembled parts.
Secure all parts by screwing the rubber cap/button
on the pump body.
Reinstall the pump into the tank opening and
attach the fuel line.
Fuel Pickup Tube and Filter Service
1. The fuel filter on the pickup tube can be inspected
without removing the pickup assembly by "fishing"
the filter out through the filter hole.
See Figure 46.
2.
Pull the pickup weight from the end of the tube and
remove the fiber filter elements. Inspect both of
3.
4.
5.
6.
7.
these elements and the fuel strainer located inside
the pickup weight. Clean or replace as necessary.
Reassemble the pickup assembly making sure that
the pickup tube fits snugly on the top of the fiber
filter element.
If pickup tube removal is desired,
it
can be
removed by removing the primer pump as
described under Primer Pump Disassembly,
page 22.
Remove the fuel pickup tube by pulling
it
out of the
tank. It is also pressed in.
Inspect the pickup tube for cracks or punctures
and replace if necessary.
Reinstall the fuel pickup tube by lightly coating the
barbed end with two cycle oil and pressing
it
into
the proper tank orifice.
FUEL CAP
Fuel Cap Operation
The fuel tank cap on the TC3000, TC4000 and TC5000
is
somewhat complex due to the requirements of the
application. The cap must vent in order to prevent a
vacuum or pressure buildup within the tank but must al
prevent leakage of fuel.
The cap accomplishes the above by using a system of
valves which work under different conditions. When the
tank is under pressure, the following occurs: See Figure
47.
UMBRELLA VALVE
' I
PACKING ORIFICE
Figure 47
1.
The pressure passes through the packing orifice
2.
The pressure passes through the two small orifices
in the valve holder and lifts the umbrella portion
of
the umbrella valve off its seat.
so that
it
can act upon the umbrella valve.
3. Pressure passes into the top of the gas cap and
isemitted to the atmosphere through the slits in the
threads of the gas cap.
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