Where is the regulator on a fuel tank?
All vehicles will have the regulator on the fuel rail containing the fuel injectors. There is a main fuel line from the fuel tank to the fuel rail and a return fuel line from the fuel pressure regulator.
Why does returnless fuel injection eliminate the return line?
Unfortunately, this carries a lot of engine heat back to the fuel tank and increases evaporative fuel vapor emissions. Relocating the regulator to the fuel tank eliminates the circulation of fuel between the engine and tank so the fuel stays cooler. It also simplifies the fuel system plumbing by eliminating the return line.
How does the return line of a fuel pressure regulator work?
This return line is located downstream of all the injectors. The fuel pressure regulator uses a diaphragm and spring combination within its housing with a vacuum source on the top side of the diaphragm to counteract the spring pressure when high demand dictates that higher fuel pressure is necessary.
How is fuel pressure controlled in a port fuel injection system?
On a conventional port fuel injection system, fuel is routed to a fuel rail on the engine to supply the injectors. Fuel pressure is controlled by a vacuum-operated mechanical regulator mounted on the fuel rail.
Why do you need a fuel pump regulator?
In fuel injection systems, it is used to build up pressure to supply the injectors with fuel. Your fuel pump supplies a consistent pressure which isn’t always right for your engine’s injectors. As you drive, the regulator alters pressure as needed. Higher RPMs require more fuel pressure to keep your engine running.
How does a return style fuel injector system work?
Return style systems hold a big advantage in that with a vacuum/boost referenced fuel pressure regulator, the system can maintain a CONSTANT effective fuel pressure, which can extend the range of fuel injectors and help them function at lower fuel demands as well.
How to rate a fuel injection pressure regulator?
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Where is the return port on a fuel pressure regulator?
Most of these regulators are designed with a pair of inlet/outlet (I/O) ports on opposite sides of the regulator with the return port on the bottom or opposite the inlet/outlets. In a typical installation, one horizontal port is plumbed as the inlet from the pump while the outlet feeds the carburetor or EFI system and the third is the return.