83 733I BMW, what should the fuel pressure from external fuel pump be?

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Fuel pressure from the "in tank" electric fuel pump s/b at least 6 psi if measured against a closed fuel line. The f/p at the pressure regulator, (under the hood, LF of engine) should regulate varying input pressures down to about 35 PSI for distribution to the (6) fuel injectors. The fuel pressure at the external mechanical under hood fuel pump should be at least 40 psi when measured against a closed fuel line. The in-tank fuel pump was designed for high volume. The mechanical fuel pump was intended for high pressure to accomodate varying engine loads Any fuel leaks in the fuel lines, junctions, connectors or injectors will cause a drop in fuel pressure and a loss of smooth running engine and or good fuel economy.

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