Kohler Command Pro CV980 - Manual (Page 31)

5.3
Section 5
Fuel System and Governor
5
Self-Relieving
Choke
Fuel Shut-Off
Solenoid
Bowl Drain Screw
Slow Jets
Bowl Vent
Low Idle Fuel
Adjustments
(With Limiters)
Fuel Pump
General
These engines use either a pulse style fuel pump,
or optional remote-mounted electric fuel pump
ŠœœŽ–‹•¢ǯȱŽŽȱ’ž›ŽœȱśȬŗȱŠ—ȱśȬŘǯȱ‘Žȱ™ž–™’—ȱŠŒ’˜—ȱ
of pulse style pumps is created by the oscillation of
positive and negative pressures within the crankcase.
‘’œȱ™›Žœœž›Žȱ’œȱ›Š—œ–’ĴŽȱ˜ȱ‘Žȱ™ž•œŽȱ™ž–™ȱ
through the rubber hose connected between the
pump and crankcase. The pumping action causes the
diaphragm on the inside of the pump to pull fuel in on
its downward stroke and to push it into the carburetor
on its upward stroke. Two check valves prevent fuel
from going backward through the pump.
Figure 5-1. Pulse Style Fuel Pump.
Figure 5-2. Optional Electric Fuel Pump.
Fuel Pump - Replacement
Replacing the Pulse Style Fuel Pump
Replacement pumps are available through your
source of supply. To replace the pulse pump follow
these steps. Note orientation of pump before
›Ž–˜Ÿ’—ǯȱŽŽȱ’ž›ŽȱśȬŗǯ
Figure 5-3. Keihin 2-Barrel Carburetor.
WARNING: Explosive Fuel
Šœ˜•’—Žȱ’œȱŽ¡›Ž–Ž•¢ȱ̊––Š‹•ŽȱŠ—ȱ’œȱŸŠ™˜›œȱŒŠ—ȱŽ¡™•˜Žȱ
’ȱ’—’Žǯȱ˜›ŽȱŠœ˜•’—Žȱ˜—•¢ȱ’—ȱŠ™™›˜ŸŽȱŒ˜—Š’—Ž›œǰȱ’—ȱ
Ž••ȱŸŽ—’•ŠŽǰȱž—˜ŒŒž™’Žȱ‹ž’•’—œǰȱŠ Š¢ȱ›˜–ȱœ™Š›”œȱ˜›ȱ
̊–Žœǯȱ˜ȱ—˜ȱꕕȱ‘ŽȱžŽ•ȱŠ—”ȱ ‘’•Žȱ‘ŽȱŽ—’—Žȱ’œȱ‘˜ȱ˜›ȱ
›ž——’—ǰȱœ’—ŒŽȱœ™’••ŽȱžŽ•ȱŒ˜ž•ȱ’—’Žȱ’ȱ’ȱŒ˜–Žœȱ’—ȱŒ˜—ŠŒȱ
’‘ȱ‘˜ȱ™Š›œȱ˜›ȱœ™Š›”œȱ›˜–ȱ’—’’˜—ǯȱ˜ȱ—˜ȱœŠ›ȱ‘Žȱ
Ž—’—Žȱ—ŽŠ›ȱœ™’••ŽȱžŽ•ǯȱŽŸŽ›ȱžœŽȱŠœ˜•’—ŽȱŠœȱŠȱŒ•ŽŠ—’—ȱ
ŠŽ—ǯ
1. Disconnect the fuel lines from the inlet, outlet
Š—ȱ™ž•œŽȱęĴ’—œȱ˜—ȱžŽ•ȱ™ž–™ǯ
ȱ Řǯȱ Ž–˜ŸŽȱ‘Žȱ ˜ȱ–˜ž—’—ȱœŒ›Ž œȱŠ—ȱŠ”Žȱ˜ěȱ
the pump.
3. Connect the pulse line to the new fuel pump and
make sure opposite end is properly connected to
˜’•ȱꕝŽ›ȱ‘˜žœ’—ȱęĴ’—ǯ
DZȱ Š”Žȱœž›Žȱ‘Žȱ˜›’Ž—Š’˜—ȱ˜ȱ‘Žȱ—Ž ȱ
pump is consistent with the removed
pump. Internal damage may occur if
installed incorrectly.
Śǯȱ ĴŠŒ‘ȱ‘Žȱ—Ž ȱžŽ•ȱ™ž–™ȱžœ’—ȱ‘Žȱ‘Ž¡ȱ̊—Žȱ
screws.Torque the screws to 2.3 N·m (20 in. lb.).
5. Reconnect the fuel lines to the inlet and outlet
ęĴ’—œȱŠ—ȱœŽŒž›Žȱ ’‘ȱ‘ŽȱŒ•Š–™œǯ
Carburetor
General
—’—Žœȱ’—ȱ‘’œȱœŽ›’ŽœȱŠ›ŽȱŽšž’™™Žȱ ’‘ȱŠȱ
Ž’‘’—ȱ

ȱ ˜Ȭ‹Š››Ž•ǰȱœ’ŽȬ›ŠĞȱŒŠ›‹ž›Ž˜›ȱ ’‘ȱę¡Žȱ–Š’—ȱ
jets on a matching intake manifold. The carburetor
features a self-relieving choke, serviceable slow
jets, main jets and a fuel shutdown solenoid. See
’ž›ŽȱśȬřǯȱ
Pulse
Fuel Pump