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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 on a 1995 M3 Lightweight 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. Over the course of E36 3-series production of USA models, BMW changed the fuel and delivery return systems at the fuel tank. Prior to models built in January of 1995, fuel was returned to the lhs, and excess fuel was then routed from the lhs to the rhs tank externally. Starting in January of 1995, the siphon was made internal. Consequently, the fuel pump, fuel level senders and fuel line arrangements differ between the early and later cars, and between OBDI and OBDII cars. European models may have had a different build history.3. Under racing conditions, the fuel in the fuel tank is subjected to substantial lateral g-forces. Many (but curiously not all) racing M3s experience fuel starvation in high-speed right-hand turns lasting more than a few seconds when the overall fuel level drops below ½-tank. The result is an instantaneous shutoff or near-shutoff of the motor – a highly undesirable racing occurrence. The driver usually regains his or her composure after the turn’s exit. Twin Pumps Assembly Guide, I used Oetiker-type band clamps because of their smaller size and fewer sharp edges when compared to conventional clamps. : Fuel Routing Diagram for Twin Fuel Pumps. Wiring in the Second Pump.
Tags : bmw e36 m3, plastic fuel tank, fuel starvation, band clamps, fuel pumps, usa models, tank fuel, european models, obdi, excess fuel, assembly guide, small passage, speed right, guide details, pump fuel
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