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Fuel Sender problem. How to test?

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  • Lippy
    replied
    Originally posted by McGyver View Post
    I did some of reading wasn't able to get a definitive answer.

    The two level senders work by changing the resistance as the float goes up/down with the fuel level. I think each should be 0-3 Ohms when full and either 35 or 70 Ohms when empty. Pull each out, test the resistance right side up (empty) and upside down (full). One of the floats may be stuck and just needs a cleaning to get moving again.

    wedophones.com has all the wiring diagrams:
    http://wedophones.com/BMWManualsLead.htm

    I didn't see a spec in the Bentley
    Cool, thanks for the info.

    Leave a comment:


  • Lippy
    replied
    Originally posted by reelizmpro View Post
    First did it happen suddenly one day? Or was it like that when you got the car?
    It was like that when I bought it in May.

    Leave a comment:


  • reelizmpro
    replied
    First did it happen suddenly one day? Or was it like that when you got the car?

    Leave a comment:


  • McGyver
    replied
    I did some of reading wasn't able to get a definitive answer.

    The two level senders work by changing the resistance as the float goes up/down with the fuel level. I think each should be 0-3 Ohms when full and either 35 or 70 Ohms when empty. Pull each out, test the resistance right side up (empty) and upside down (full). One of the floats may be stuck and just needs a cleaning to get moving again.

    wedophones.com has all the wiring diagrams:
    http://wedophones.com/BMWManualsLead.htm

    I didn't see a spec in the Bentley

    Leave a comment:


  • Lippy
    started a topic Fuel Sender problem. How to test?

    Fuel Sender problem. How to test?

    So, my fuel gauge only reads a little over half when I fill it up. I'm assuming one of the fuel senders is bad on one of the pumps.
    What is the best way to test which sending unit it is? I have a 88 325i convertible and it looks like the 2 are different. I just need to figure out which one I need to buy. Thanks!
    Last edited by Lippy; 08-05-2022, 09:24 PM.
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