Need help diagnosing a fuel gauge problem

Discussion in 'International Forum' started by Antonovich, May 5, 2021.

  1. Antonovich

    Antonovich Light Load Member

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    May 11, 2019
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    I have a 2007 International 9400i. My fuel gauge is currently pegged past the max level no matter how much fuel is actually in the tanks. Previously, whenever I'd fill up the tanks, my fuel gauge would jump around from max level on the gauge to just past it. So I replaced the gauge, and it did not fix the jumping problem.

    With my current issue, I'm thinking it's the sending unit. I'm guessing it's either stuck, or finally crapped the bed (truck has 1.35m miles on it). Or maybe something wrong with the wiring or the connector...?

    If it is the sending unit, how hard is it to replace on the 9400i? Would I need to drop the tanks or lift the cab a bit to get it out?
     
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  3. Smellfunny

    Smellfunny Road Train Member

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    The new ones are in a tube and usually require the tank to come down. You can test the old one by taking a paper clip and jumping the two connections at the top of the sending unit. Since yours is going to max you may want to remove the wires to do so. Key on. Removed it should show zero. Wires touched = max. If it does not do that then you may have wiring issue.
     
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  4. ChuckMartel

    ChuckMartel Light Load Member

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    Jan 22, 2021
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    Typically if you drain the fuel out you can just loosen the tank straps, support it with a transmission jack and turn the tank to remove the sending unit.
     
  5. Antonovich

    Antonovich Light Load Member

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    May 11, 2019
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    Got caught up with work and kind of forgot about this thread... Anyway, I did check the sender - I unplugged it while truck was running, and the gauge is still pegged past max. So if it's not the sender, lets assume it's not the gauge it self either, how can I check the wiring? I mean what exactly do I check? I have a multimeter.
     
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