Under racing conditions, the engine in the BMW E36 M3 may "starve" for fuel when the amount of gasoline in its tanks falls below a certain level. This Application Guide details the installation of twin fuel pumps to alleviate this problem.
The E36 3 series1 uses a molded one-piece plastic fuel tank under the rear passenger seats. A small passage over the driveshaft connects the two tank halves. Fuel is added through the filler pipe. Fuel is extracted from the right-hand-side2 (rhs) of the fuel tank via an in-tank fuel pump. The fuel passes through a filter and pressurizes the fuel rail, to which the injectors are attached. At the end of the fuel rail is the fuel pressure regulator (FPR). It maintains a constant fuel pressure relative to atmospheric pressure and returns excess fuel to the left-hand-side (lhs) of the fuel tank.
Since the crossover tube is located at the top of the fuel tank, the fuel levels in the left and right side of the tank cannot be equalized without some type of siphoning arrangement. The siphon works to equalize the level of the two tanks. Fuel is returned (under pressure) to the lhs tank, and over time the siphon equalizes the levels in the two tanks. Download free Avoiding Fuel Starvation in the BMW E36 M3 via the Installation of Twin Fuel Pumps.pdf here
The E36 3 series1 uses a molded one-piece plastic fuel tank under the rear passenger seats. A small passage over the driveshaft connects the two tank halves. Fuel is added through the filler pipe. Fuel is extracted from the right-hand-side2 (rhs) of the fuel tank via an in-tank fuel pump. The fuel passes through a filter and pressurizes the fuel rail, to which the injectors are attached. At the end of the fuel rail is the fuel pressure regulator (FPR). It maintains a constant fuel pressure relative to atmospheric pressure and returns excess fuel to the left-hand-side (lhs) of the fuel tank.
Since the crossover tube is located at the top of the fuel tank, the fuel levels in the left and right side of the tank cannot be equalized without some type of siphoning arrangement. The siphon works to equalize the level of the two tanks. Fuel is returned (under pressure) to the lhs tank, and over time the siphon equalizes the levels in the two tanks. Download free Avoiding Fuel Starvation in the BMW E36 M3 via the Installation of Twin Fuel Pumps.pdf here
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