Suzuki DF 50 Service Manual

3-15 ENGINE CONTROL SYSTEM
FUEL DELIVERY SYSTEM COMPONENTS
The fuel delivery system is composed of the low pressure line components (fuel tank, filter , pump etc.), fuel
vapor separator, high pressure fuel pump, high pressure fuel filter, fuel pressure regulator (located in the
fuel vapor separator), fuel injector and hoses.
Fuel is supplied through the primer bulb, low pressure fuel filter, and low pressure pump to the fuel vapor
separator.
Fuel flow from the fuel vapor separator is pressurized by the high pressure fuel pump and supplied through
the high pressure fuel filter and fuel delivery gallery to the fuel injectors.
The pressure regulator maintains fuel pressure in the feed line between the high pressure fuel pump and
fuel injector.
This pressure , maintained at a constant level, is higher than the pressure in the vapor separator chamber.
When fuel feed line pressure exceeds vapor separator chamber pressure by more than approx. 250 kPa
(2.55 kg/cm
2
, 36.3 psi.), the valve in the fuel pressure regulator will open and return the excess fuel to the
vapor separator chamber.
Pressurized fuel enters into the intake ports through the fuel injector based on the sequential signals sup-
plied from the ECM.
Exhaust
manifold
Fuel injector
Throttle body
Intake
manifold
Silencer
Fuel tank
Primer bulb
Low pressure
fuel filter
Low pressure
fuel pump
Evaporation
hose
Fuel
vapor
separator
Fuel
pressure
regulator
High
pressure
fuel pump
Breather
hose
High
pressure
fuel
filter
Delivery
gallery

Suzuki DF 50 Specifications

General

Engine Type	4-Stroke
Cylinders	3
Displacement	941 cc
Starting System	Electric
Steering	Remote
Engine Type Detail	DOHC 12-Valve
Maximum Output	50 HP
Ignition System	Digital CDI
Alternator	12V 19A
Gear Ratio	2.27:1
Exhaust	Through Prop Hub Exhaust
Trim Method	Power Trim and Tilt
Max Power	50 HP
Alternator Output	12V 19A
Fuel Delivery System	Sequential Multi Point Electronic Fuel Injection
Full Throttle Operating Range	5, 300 - 6, 300 rpm
Engine Oil Capacity	2.7 L
Full Throttle RPM Range	5300 - 6300 RPM
Oil Capacity	2.7 L
Bore x Stroke	72.5 x 76.0 mm (2.85 x 2.99 in.)