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Lp 640 fuel tank reading full when it’s not full


Quadtrac600
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Anyone know if the tanks are sensors or manual? Could be a wide array of issues from complex to simple. Any other things going on with the dash?

 

No nothing else on the dash, just read full from the first time I had started it. It sat for six months before and can’t recall it reading full had only a quarter tank when stored.

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Is it full or pegged past full? If it's staying there, then there is likely a grounding issue somewhere. If it's reading full when half but still dropping as fuel is used then you likely have a signal issue.

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No nothing else on the dash, just read full from the first time I had started it. It sat for six months before and can’t recall it reading full had only a quarter tank when stored.

 

Because it sat for 6 months, I wonder has the fuel gummed up and prevented the fuel gauge from working properly?

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I had the same issue in my previous LP640 after the fuel tank was replaced on the recall. After driving at least 100+ miles it would still read full, then drop a bit. I never really trusted it at 1/4 tank. My current LP640 has had the recall and also seems to read full longer than one would expect.

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I had something replaced in my fuel tank when that happened to my LP640 - was a fairly sizable job as they had to remove it to install.

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Thank you for the help, i as well had the recall done, first time this happens, I’ll drive and post further information, thank you everyone.

 

I think I read somewhere that this happened and a fix was to turn the battery power off for a while and then on again, cant hurt to try as many strange things happen through a depleted battery.

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