gas gauge reading when full but goes down quickly

cudajim said

I'll yank the sender out this weekend and give an update. I expect I'll find a bad sender.... should have bought the spectra fg69a in the first place instead of the cheap Chinese clone.

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Get a picture of that one before you buy it. Very good chance it's the same as the cheap "chinese" ones.

Just look at your old sender, next to the new ones. They are designed very different. Much beyond the ohm reading.