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Old 03-09-2023, 12:23 AM   #6
RustyPile
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Join Date: Dec 2017
Location: Elkhart, Texas
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Re: Gas Gauge/sending unit issues…

Quote:
Originally Posted by inkslingrrr View Post
OK, so back to you gurus for some assistance.
I replaced the gas tank in my ‘71 c10 from the behind the seat version to the bed rails kind from LMC. Now with a full tank, the (stock) gauge reads just under half. Tested the sending unit seems to work OK, pulled it out tested it by hand, Can still only get it to read just under half. Where do I start. Should I believe this is the resistors on the old gauge?
Once I learn to post pictures I’ll get some on here
If the circuit is wired correctly and the grounds are good, it sounds like you have the wrong sending unit. With a full tank, a 30 ohm sending unit will read just under 1/2 tank when connected to a 90 ohm gauge.
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