BMW 3 Series Service Manual
Contents
1. FUEL TANK AND FUEL PumP 160 5 Fuel level senders testing The left and right fuel level sending units are wired in series The fuel gauge receives a signal that is the average of the two input values 1 Remove rear seat cushion lift up insulation mats and remove both fuel tank access covers 2 Disconnect white plug on each sending unit See Fig 6 0013187 amp 0013194 Fig 6 Fuel pump level sender terminal identification Check resis tance at terminals of white connectors arrows 3 Check resistance value of each sending unit Values should be the same 5 If values are different remove sending units as described below and check resistance values across terminals Table a lists resistance values for senders at various float positions NOTE The compensating siphon pump Fig 1 maintains the fuel level between the right and left tank lobes If the re sistances are different between the left and right send ers remove the senders and visually inspect the level in each lobe If the level is different check the siphon com pensating pump Table a Fuel Level Sender Resistances oats Fioat position Right side empty Right side full Left side empty Left side full Fuel level sender right side and fuel pump removing and installing 1 Disconnect negative cable from battery CAUTION 7 Prior to disconnecting the battery read the battery disconnection2. cautions given at the front of this manual on page viii 2 Drain fuel from tank as described earlier WARNING Always unscrew the fuel tank cap to release pres sure in the tank before working on the tank or lines 3 Remove rear seat cushion and pull back insulation pad under right side a 4 Remove screws holding right fuel tank access cover Remove cover a _ Label fuel hoses Disconnect hoses and harness con nectors from fuel sending unit and fuel pump gt S Unscrew threaded collar from fuel pump fuel level sender Slowly withdraw assembly from tank allowing fuel to drain off See Fig 7 Ss O e f necessary push level sender arm toward fuel pump assembly to facilitate removal r NOTE DS BMW special tool no 16 1 020 should be used to re move and install the threaded collar Damage to the collar may result if the special tool is not used WARNING Fuel may be spilled Do not smoke or work near heaters or other fire hazards 7 Using a new sealing ring install pump and sending unit being sure that fuel line connections point in same direction as they came out 8 Reconnect harness connector and hoses Fill tank and check for leaks by running engine Install access cover and its mounting screws Reconnect negative cable to battery CAUTION Before starting the engine fill the fuel tank with at least 1 5 gallons 5 liters of fuel The pu
3. mp will be damaged if you run it without fuel FUEL LEVEL SENDERS
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