In a returnless system, the pressure regulator is in the fuel tank and excess fuel is released to the tank.

Name: In a returnless system, the pressure regulator is in the fuel tank and excess fuel is released to the tank.
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In a returnless fuel system, the fuel pressure regulator is often located within the fuel tank, and any excess fuel not used by the engine is released back into the tank, eliminating the need for fuel to return to the tank through a separate line.

In a Returnless System, the Pressure Regulator Is in the Fuel