fuel guage - Impala Tech
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post #1 of 3 (permalink) Old 04-13-2012, 04:11 PM Thread Starter
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fuel guage

ok so a while ago you guys helped me diagnose my fuel guage problem. Determined it was a bad sending unit. I got one off ebay that looks to be the same as the ones in all the good impala catalogs (just a little cheaper). My old one was the old soup can style which doesnt appear to be made anymore. Anyway, I replaced it and got it all back together but now it only reads a little less than 3/4 full after ive filled the tank (23-24 gallons). accordingly, it reads empty about 1/4 before i actually am empty. Any ideas??
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post #2 of 3 (permalink) Old 04-13-2012, 05:02 PM
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Wrong resistance! Probably it is the most common 90 Ohm when your car may have used a 30 Ohm; but I'm guessing.

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post #3 of 3 (permalink) Old 04-13-2012, 05:12 PM
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I just bought one for my '70 Chevelle SS from Rock Auto (Spectra Premium for $39). I made sure I did 2 critical tests BEFORE I nstalled it.

1. Electrical Test: Using two alligator clipped test leads... Empty to Full - Full to Empty several times.

2. Float Test: Make sure the float actually FLOATS in a coffee can of water for an hr or so.

Cant be too sure...
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