Fuel tank full but gauge at 3/4 tank? Why?

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Old Dec 2, 2004 | 04:05 PM
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Default Fuel tank full but gauge at 3/4 tank? Why?

Hey,

n00b here my '91 CRX Si's fuel gauge never goes to 100% it always sits at 75%, anyone know why? Is this normal? I'm an idiot....
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Old Dec 2, 2004 | 04:17 PM
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metric's Avatar
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From: houston, tx, us
Default Re: Fuel tank full but gauge at 3/4 tank? Why? (staticCRX)

you're going to need a need fuel sending unit. this requires dropping the gas tank
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Old Dec 2, 2004 | 04:19 PM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (staticCRX)

If the gage in the cluster doesn't move at all replace the gage. You need an ohmmeter for the next part. Remove the back seat and remove the fuel level sending unit. Move the float up and down to simulate empty, 1/2 full, and full. Resistance should be 105-110 ohms (empty), 25.5-39.5 ohms (1/2 full), 2-5 ohms (full). Replace sending unit if resistance readings are out of spec.
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Old Dec 2, 2004 | 04:20 PM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (eda6)

its not the floater thats causing this?
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Old Dec 2, 2004 | 04:31 PM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (SpankyofNOLA)

::shrugs:: sounds good guys...this at least gives me an idea where to aim...I'm not gonna worry about it too much right now (unless you think I should?). I just ordered the RS*R ExMag exhaust so I'm a lil more into getting that on. Thanks again.
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Old Dec 2, 2004 | 05:08 PM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (eda6)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eda6 &raquo;</TD></TR><TR><TD CLASS="quote">If the gage in the cluster doesn't move at all replace the gage. You need an ohmmeter for the next part. Remove the back seat and remove the fuel level sending unit. Move the float up and down to simulate empty, 1/2 full, and full. Resistance should be 105-110 ohms (empty), 25.5-39.5 ohms (1/2 full), 2-5 ohms (full). Replace sending unit if resistance readings are out of spec.</TD></TR></TABLE>

Wow, good info
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Old Dec 11, 2004 | 08:10 AM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (HatchBox)

how many miles do you guys normally get outta one tank?
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Old Dec 11, 2004 | 08:56 AM
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Default Re: Fuel tank full but gauge at 3/4 tank? Why? (staticCRX)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by staticCRX &raquo;</TD></TR><TR><TD CLASS="quote">how many miles do you guys normally get outta one tank?</TD></TR></TABLE>

i get 250 - 370 depending on my driving habits
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Old Dec 11, 2004 | 10:56 AM
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From: DES MOINES, IA/ O.C., USA... EAGLE ROCK, CA
Default

my guess is of course is a faulty gauge...
i get usually 260-400 depending on how fast i drive
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