MotorVac CarbonClean1000 User Manual
Page 11
2012 MotorVac, Inc.
10
Returnless Fuel System
A returnless fuel system has only one fuel line going from the fuel tank to the fuel rail.
They can have the pressure controlled by either a mechanical pressure regulator or
electronically by a PCM. Excess fuel does not pass through the fuel rail and engine
compartment.