MotorVac CarbonClean System II LE-1 - Manual (Page 14)

Overview
1998 MotorVac Technologies, xiii
Fuel System Cleaning Procedures
Determining the Vehicle's Fuel System Type
It is very important to determine the fuel system type of the vehicle to be serviced before performing
any setup or cleaning procedure on the vehicle. The unit can be used with any of the four different types
of fuel systems listed below:
Carburetion
Carburetors come in a variety of sizes and shapes. These can be easily identified by
locating the choke plate in the air horn.
Throttle Body Injection (TBI)
Throttle bodies are centrally mounted, as are carburetors, and use one or two electronic
injectors.
Port Fuel Injection (PFI)
This system uses a single electronic injector per cylinder, mounted so that fuel spray is
directed into the intake port.
Continuous Injection System (CIS)
A Continuous Injection System is easily identified by noting the fuel distributor and the
solid steel or flex steel lines running from the fuel distributor to each individual injector.
The fuel distributor controls the amount of fuel sprayed into the intake port while the
injectors control the opening and closing pressure.
NOTE
Once you have determined the fuel system type,
turn to the appropriate section in this chapter for
instructions on how to perform the fuel line setup
and cleaning procedure for that system.