MotorVac CarbonClean Dual System MCS 352 - Manual (Page 26)

Port Fuel Injection (PFI) Cleaning Procedure
Follow these steps to circulate the cleaning mixture through the Port Fuel Injection unit to clean the
fuel rail, injector screens, and pressure regulator.
1. Verify that PFI Setup Steps 1-10 above have been completed before continuing.
2. Refer to the vehicle's service manual for the manufacturer's recommended pressure.
3. Adjust TIMER knob for 10 minutes. Press the ON/OFF switch on.
4. Press and hold the START/RUN switch.
5. Turn the Gasoline (Petrol) PRESSURE REGULATOR clockwise until the PRESSURE
GAUGE reads past 4 PSI. The pump will remain on.
6. Release the START/RUN switch and continue to turn the Gasoline (Petrol) PRESSURE
REGULATOR clockwise until it is completely closed. This will clean the PFI unit, injector
screens, fuel rail, and pressure regulator while filtering contaminants through the unit’s filter.
Check all connections for leaks.
x Make a note of the fuel pressure reading; this is the true opening pressure of the vehicle's
pressure regulator without vacuum assist when the engine is at normal operating
temperature.
x NOTE: By turning the Gasoline (Petrol) PRESSURE REGULATOR in and out and
“PULSING” the mixture from time to time, the cleaning process will be enhanced.
After the 10 minutes has expired, adjust TIMER to 30 minutes. (Run time may be adjusted
depending on the condition of the vehicle’s fuel system.)
7. Press the START/RUN switch.
8. Start the vehicle to begin the fuel system cleaning process.
9. When the run time expires, the cleaning is complete. The unit will automatically shut off and
the alarm will sound. Press off the
ON/OFF switch.
10. Turn OFF the vehicle's ignition.
12. Turn the Gasoline (Petrol) PRESSURE REGULATOR counterclockwise on the unit to
release any residual pressure.