90-824052R3 JUNE 2002 FUEL SYSTEMS - 3B-29
WMV Carburetor Fuel Circuit
Description
Float Bowl Circuit
Air
Fuel
Key
b
a
c
j
i
h
g
fe
d
a - To Engine Crankcase
b - Throttle Plate
c - Carburetor Venturi
d - Float
e - Float Bowl
f - Main Fuel Well
g - Main Jet
h - Fuel from Fuel Pump
i - Inlet Seat
j - Inlet Needle
Fuel from the fuel pump enters the carburetor
through the fuel inlet fitting and fills the bowl until the
float moves the inlet needle against the fuel inlet seat.
With the inlet needle against the inlet seat, the fuel
inside the float bowl is at it’s maximum level. Fuel
inside the bowl flows through the main fuel jet and fills
the main fuel well.
Idle Circuit
Top View –
k
ji
h
a
b
d
e
f
g
c
a - Idle Discharge Ports
b - Off-Idle Discharge Ports
c - Idle Fuel Transfer Passage
d - Idle Mixture Screw
e - Main Discharge Vent Tube
f - Idle Pickup Tube
g - Idle Air Passage
h - Thermal Air Valve Air Inlet
i - Top Cover Mounting Flange
j - Idle Mixture Screw
k - Throttle Shaft
Side View –
Air
Fuel
Key
e
f
d
c
k
l
m
n
a
b
g
i
h
j
a - Idle Passage
b - Idle Mixture Screw
c - Back Draft Jet
d - Idle Air Jet
e - Thermal Air Valve (open)
f - Air Flow
g - Float Bowl
h - Idle Pickup Tube
i - Main Fuel Jet
j - Main Fuel Well
k - Idle Air Bypass
l - Throttle Plate
m - Off-Idle Ports
n - Off-Idle Passage
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