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#3256334 - 01/22/14 02:02 PM Inaccurate fuel gauge on 1995 Buick Roadmaster
10WSmuckers Offline


Registered: 01/25/13
Posts: 16
Loc: Avondale
I have a 1995 Roadmaster with 55k miles. I am wondering if this is an easy DIY fix. The gauge's behavior isn't erratic in my opinion. I had one minor incident where it completely sputtered out of gas while the gauge read just under a quarter tank, with no low fuel indicator to alert me beforehand (Not to mention the light has come on before). Lucky for me I was close to a QuikTrip.

The gauge doesn't even drop like a rock after the needle reaches half a tank. It's just not calibrated correctly. Minor electrical work is in my ballpark but this leaves me stumped.

How would one calibrate a sending unit to read out accurately??


Edited by 10WSmuckers (01/22/14 02:02 PM)

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#3256353 - 01/22/14 02:14 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
satinsilver Offline


Registered: 01/24/08
Posts: 2913
Loc: Ohio
Bottle of Chevron Techron. A number of guys on here have used it to fix the same problem you mentioned.

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#3256431 - 01/22/14 03:09 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
Trav Offline


Registered: 11/20/06
Posts: 10046
Loc: MA, Mittelfranken.de
Try the Techron Concentrate Plus Fuel System Cleaner first as was suggested, use the 20oz bottle.
If that doesn't work you will have to replace the sending unit (i believe you need to drop the tank on this one) or live with it.
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#3256446 - 01/22/14 03:30 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: satinsilver]
Nyati Offline


Registered: 10/22/12
Posts: 130
Loc: Dixieland
Originally Posted By: satinsilver
Bottle of Chevron Techron. A number of guys on here have used it to fix the same problem you mentioned.


^ This

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#3256500 - 01/22/14 04:21 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
Clevy Offline


Registered: 11/11/10
Posts: 7437
Loc: Saskatoon canada
I've read about a strong dose of techron helping and I've also read many times that mmo fixed the issue as well as using tc-w3 or seafoam.
Point being is that the float in the sender may be stuck and that's what's causing the issue. Cleaning the deposits that's causing the float to stick and lubricating the float itself so it slides easier all can help fix the problem.
Personally I'd try attacking it from 2 sides. I'd use mmo treated a bit stronger than the instructions AND buy the biggest bottle of techron I can find and add it to the tank too.
Try that with 2 tanks of fuel. If it doesn't work by the end of the second tank you can either drop the tank and replace the part or live with it.
We had a caprice with the same issue. Tc-w3 in the fuel with every tank kept it from recurring but to get it loose I think I poured a quart of acetone in the fuel along with a quart of tranny fluid(I was a teenager/pre bitog/pre-any sensibility at all) and what got it loose was all that stuff and a washboard gravel road.
Tc-w3 made it never get stuck again afterwards.
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#3256530 - 01/22/14 05:13 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
SuperDave456 Offline


Registered: 10/29/08
Posts: 2255
Loc: Dallas, Texas
+1 on the cleaners.
Any of the Techron, MMO, TCW3, or Redline Fuel System cleaners will work wonders.
Give it at least 2 tanks back to back to work.

And please keep us notified of any progress or lack there of.

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#3256631 - 01/22/14 07:00 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
clinebarger Offline


Registered: 12/19/13
Posts: 207
Loc: Fort Worth, Texas
I would consider just replacing the Sender along with the Fuel Pump...If the pump is original, It's approaching 20 years old.

Love the LT1 B/D-bodies!!
_________________________
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2006 Chevy 2500HD LBZ/Allison 1000
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#3256941 - 01/22/14 11:34 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
GMBoy Offline


Registered: 11/22/04
Posts: 6658
Loc: Texas
The TECHRON recommendation is right on point. GM even has a Bulletin that mentions that same repair. I have used it to fix sending units in the past as well - try that first as it certainly is a cheap fix and cleaning your fuel system is a plus even if it doesn't work. Be sure to get enough as many times the bottles on the shelf only treat 12 gallons so get 2 or find the large bottle. I would run a high concentrated dose the first tank then run another tank at the normal dose.

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#3256944 - 01/22/14 11:36 PM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
user52165 Offline


Registered: 10/21/11
Posts: 736
Loc: CA
This:

http://www.fuelgaugecalibrator.com/bbody/bbody.html

I have your car also. Join the Impala SS forum for everything LT1 related. Good thread for you:

http://www.impalassforum.com/vBulletin/showthread.php?t=235185&highlight=fuel+sender

Chemicals will not correct an improper calibration or 20 year old wiring.


Edited by user52165 (01/22/14 11:44 PM)

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#3256994 - 01/23/14 02:40 AM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: 10WSmuckers]
901Memphis Offline


Registered: 08/14/10
Posts: 6158
Loc: Northern Kentucky
As big a gas tank as that thing has use 2x20oz Techron the first time.
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1999 Ford Taurus 146k (Vulcan v6) - M1 High Mileage 5w30 | Fram Ultra XG 3600
2002 Buick Century 105k - Peak 5w30 / Fram Ultra XG 3980 / Filter mag

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#3258525 - 01/24/14 11:01 AM Re: Inaccurate fuel gauge on 1995 Buick Roadmaster [Re: user52165]
Trav Offline


Registered: 11/20/06
Posts: 10046
Loc: MA, Mittelfranken.de
Originally Posted By: user52165
This:

http://www.fuelgaugecalibrator.com/bbody/bbody.html

I have your car also. Join the Impala SS forum for everything LT1 related. Good thread for you:

http://www.impalassforum.com/vBulletin/showthread.php?t=235185&highlight=fuel+sender

Chemicals will not correct an improper calibration or 20 year old wiring.


Nice! Thanks for posting this, you learn something new everyday.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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