Toro 51643 - Inspection; Reassembly

Primer Pump Operation (cont'd)
2. The inlet valve is drawn toward the porous valve
cushion which allows fuel to be drawn from the
pickup line inside the tank. This action fills the
primer diaphragm with fuel and readies
it for the
next pump.
Primer Pump Disassembly
1. Pull the primer pump from the tank and remove the
fuel line. The primer pump is press fit into the fuel
tank. See Figure
42.
Figure 44
Figure 42
2. Unscrew the rubber cap/button from the pump.
See Figure
43.
Figure 43
3. Carefully lift out the top valve seat with the valve
cushion, and
two ball valves. See Figure 44
4. Insert a thin, non-puncturing punch through the
hole in the bottom of the pump and carefully push
out gasket A, valve seat A with valve cushion, and
gasket B.
22
Primer Pump Inspection
1. Inspect the disassembled primer pump for
2. Clean thoroughly in a mild soap and water solution.
3. If the primer pump is suspect after inspection, the
entire primer pump assembly should be replaced.
contamination or damaged parts.
Primer Pump Reassembly
1. Before reassembling, familiarize yourself with the
configuration of the parts
to ensure they are
properly installed.
See Figure 45.
GASKET E
\
VALVE SEATE
PUMP BODY
Figure 45
Gasket “B” has two sizes of fuel orifices one
Gasket
"A" has one size of fuel orifices both
large and one small.
large.
n