: I am currently working on the fuel system of my project car (e21 with 3.5 from a 635CSI. I know the pump feeds the fuel to a pressure accumulator, then to a filter, through a pressure regulator, and then to the fuel rail. Is the fuel pump supposed to run all the time when the ignition is switched on? : The pressure regulator works on the vacuum in the intake manifold. Does the regulator cut the flow of fuel entirely when there is no vacuum in the intake manifold? : I'm asking because today I hooked up all the fuel system components and then put everything under pressure by putting starter cables directly to the pump (just to check for any leaks). After the pump had built up pressure it seemed like it kept on trying to built even more pressure, making a lot of noise. If the pressure regulator cuts the flow of fuel to the fuel rail when there is no vacuum, and because of that fuel cannot be pumped back to the tank, then where is the pump trying to pump the fuel to? Thanks in advance for any help.
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