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Message: <blockquote data-quote="jarance" data-source="post: 41676" data-attributes="member: 21">actually the fuel tank is only one but seperated into two chamber. There is two chambers because the lower section is seperated into half to make way for the exhaust pipe. But the is only true for the lower part of the tank. When the tank is more than 50 % of petrol, there is no seperation between the tank. have a look of the fuel tank of a typical E36 (extract from ETK) [/b]</blockquote>there are two level sensors for the fuel tank. To access, you have to remove the rear seat. There are two black covers for the fuel sensor. On the driver, the fuel pump and 1 level sensor. On the passenger side, there is the second sensor. yes there is a hose that connected both of the level sensor. The hose basically act as an equaliser by siphoning the fuel from one side to the other. hence the pump will always suck and pump from the chamber on the driver side and fuel is drawn from the passenger side by the hose when the fuel level is low..have a look at the fuel sensor and pump..(extract from ETK)[/QUOTE]