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The BMW Range
3 Series
erratic fuel gauge.. help
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<blockquote data-quote="jarance" data-source="post: 196854" data-attributes="member: 21"><p>There are 2 fuel sender located under the passenger seat. On the driver side, the fuel sender have a fuel pump integrated with it whereas the left side do no have the fuel pump. Based on my observation, the fuel sender with the fuel pump have tendency to be faulty. This is due to the additional weight of the pump. When you go over a bump, the rubber absorber will absorb the shock but overtime, the absorber cannot absorb the shock and will go jerks down more than the cable slack. this will cause the cable to snap or most probably have a bad contact. That is why chaoroger say the pump unit need to be replaced coz you cannot buy the unit seperately. However, I have repaired the sender unit by resolder new cable with extra slack. To verify whether it is your sender unit that is the problem, remove the car seat and check for the connectors. One side should have 2 connectors and the other side should have one connector. the one with the additional connector is the one with the fuel pump. compare the colour of the connectors. The fuel pump connector is different from the fuel pump unit.</p><p></p><p>disconnected the connectors of the same colour and measure the resistance of each of the fuel sender. The reisistance should be around 10 to 150 ohms depending on the amount of fuel in the tank. if the value are out of the spec, open it to check further.</p></blockquote><p></p>
[QUOTE="jarance, post: 196854, member: 21"] There are 2 fuel sender located under the passenger seat. On the driver side, the fuel sender have a fuel pump integrated with it whereas the left side do no have the fuel pump. Based on my observation, the fuel sender with the fuel pump have tendency to be faulty. This is due to the additional weight of the pump. When you go over a bump, the rubber absorber will absorb the shock but overtime, the absorber cannot absorb the shock and will go jerks down more than the cable slack. this will cause the cable to snap or most probably have a bad contact. That is why chaoroger say the pump unit need to be replaced coz you cannot buy the unit seperately. However, I have repaired the sender unit by resolder new cable with extra slack. To verify whether it is your sender unit that is the problem, remove the car seat and check for the connectors. One side should have 2 connectors and the other side should have one connector. the one with the additional connector is the one with the fuel pump. compare the colour of the connectors. The fuel pump connector is different from the fuel pump unit. disconnected the connectors of the same colour and measure the resistance of each of the fuel sender. The reisistance should be around 10 to 150 ohms depending on the amount of fuel in the tank. if the value are out of the spec, open it to check further. [/QUOTE]
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erratic fuel gauge.. help
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