MotorVac CarbonClean1000 - Manual (Page 22)

    2012 MotorVac, Inc.
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8. The pressure can be relieved by doing the following. Turn air pressure regulator
counter-clockwise until the machine pressure gauge reads zero. Press and hold
the flow test button on the back of the CarbonClean 1000. This will lower the
pressure by purging the excess fluid into the flow test bottle mounted on the back
of the machine.
9. Remove adapters from the fuel lines and reconnect the vehicles fuel lines. Start
engine and ensure there are no leaks and the lines have not become kinked or
damaged.
Pressure
relief/fuel system
flow test button