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fuel reading

yes that drop in ohm's will give u false reading as u've found. now u need to MAKE sure u have a good ground on tank. even if u run a new wire from tk to ground. u may have bad wire from tk to firewall. that wire is most likely around a 16ga. u can just get around 10' of it and measure the ohms so u have a good idea what your looking for.. it should be very close to a short.
 

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sending units

one way to test fuel is have a helper. u need to know the height of tank so u know swing. key on and have helper move float up and down kinda slow. . with temp, ground the wire to the sender and gage will move full scale so u know gage is working.
 
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