MotorVac CarbonClean System MCS 245 - Manual (Page 42)

Returnless System Cleaning Procedure
Follow the steps below to feed the fuel/detergent mixture into the vehicle's fuel injector system.
1. Verify that the Returnless System Setup Steps 1- 8 above have been completed.
NOTE: The rail flush procedure is not performed on a Returnless System.
2. Refer to the vehicle's service manual for the manufacturer's recommended PSI.
• Refer to appropriate Intake System Cleaning Procedure chapter for system cleaning at this
point, and Vacuum gauge connections in the vehicle diagnostics chapter.
3. Press and hold the Start button until unit builds pressure (See step 4).
4.
Turn the Pressure Adjust regulator clockwise until the Fuel Pressure gauge reads
the equivalent of the manufacturer's recommended specifications. It may be necessary
to increase the pressure to the level previously noted .
5. Press the ­ button to increases the time, or the ▬ button to decreases the time until the Time LED
displays 30 minutes. (Run time may be adjusted depending on the condition of the vehicle’s fuel system.
Add additional run time to compensate for no rail flush.)
6. Start the vehicle to begin the fuel system cleaning process.
• When the cleaning process is halfway completed (check Time LED display), step on the vehicle’s
accelerator quickly three or four times. Then, maintain RPM at 1500 - 2000 for 30 seconds.
7. When the run time expires, the cleaning is complete. The unit will automatically shut off and purge the
pressure lines for five seconds. The
Cycle Complete LED on the control panel will illuminate, and the
unit’s alarm will sound.
8. Turn OFF the vehicle's ignition.
9.
Turn the Pressure Adjust regulator counterclockwise on the unit to open it. Press and
hold the Fill/Purge button for four seconds to relieve pressure from the output ( red )
hose. Release the Fill/Purge button.
10. Loosen the vehicle's gas cap to relieve fuel tank pressure, and then re-install cap.